1
|
Hess SC, Weiss KCB, Custer JM, Lewis JS, Kraberger S, Varsani A. Identification of small circular DNA viruses in coyote fecal samples from Arizona (USA). Arch Virol 2023; 169:12. [PMID: 38151635 DOI: 10.1007/s00705-023-05937-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2023] [Accepted: 11/22/2023] [Indexed: 12/29/2023]
Abstract
Coyotes (Canis latrans) have a broad geographic distribution across North and Central America. Despite their widespread presence in urban environments in the USA, there is limited information regarding viruses associated with coyotes in the USA and in particular the state of Arizona. To explore viruses associated with coyotes, particularly small DNA viruses, 44 scat samples were collected (April-June 2021 and November 2021-January 2022) along the Salt River near Phoenix, Arizona (USA), along 43 transects (500 m). From these samples, we identified 11 viral genomes: two novel circoviruses, six unclassified cressdnaviruses, and two anelloviruses. One of the circoviruses is most closely related to a circovirus sequence identified from an aerosolized dust sample in Arizona, USA. The second circovirus is most closely related to a rodent-associated circovirus and canine circovirus. Of the unclassified cressdnaviruses, three encode replication-associated proteins that are similar to those found in protists (Histomonas meleagridis and Monocercomonoides exilis), implying an evolutionary relationship with or a connection to similar unidentified protist hosts. The two anelloviruses are most closely related to those found in rodents, and this suggests a diet-related identification.
Collapse
Affiliation(s)
- Savage C Hess
- The School of Life Sciences, Arizona State University, 427 E Tyler Mall, Tempe, AZ, 85281, USA
| | - Katherine C B Weiss
- The School of Life Sciences, Arizona State University, 427 E Tyler Mall, Tempe, AZ, 85281, USA
| | - Joy M Custer
- The Biodesign Center for Fundamental and Applied Microbiomics, Arizona State University, 1001 S. McAllister Ave, Tempe, AZ, 85287, USA
| | - Jesse S Lewis
- College of Integrative Sciences and Arts, Arizona State University, Polytechnic Campus, 6073 South Backus Mall, Mesa, AZ, 85212, USA
| | - Simona Kraberger
- The Biodesign Center for Fundamental and Applied Microbiomics, Arizona State University, 1001 S. McAllister Ave, Tempe, AZ, 85287, USA
| | - Arvind Varsani
- The School of Life Sciences, Arizona State University, 427 E Tyler Mall, Tempe, AZ, 85281, USA.
- The Biodesign Center for Fundamental and Applied Microbiomics, Arizona State University, 1001 S. McAllister Ave, Tempe, AZ, 85287, USA.
- Center of Evolution and Medicine, Arizona State University, 427 E Tyler Mall, Tempe, AZ, 85281, USA.
- Structural Biology Research Unit, Department of Integrative Biomedical Sciences, University of Cape Town, Cape Town, 7925, South Africa.
| |
Collapse
|
2
|
de Carvalho Ruthner Batista HB, Vieira LFP, Kawai JGC, de Oliveira Fahl W, Barboza CM, Achkar S, de Novaes Oliveira R, Brandão PE, Carnieli Junior P. Dispersion and diversification of Lyssavirus rabies transmitted from haematophagous bats Desmodus rotundus: a phylogeographical study. Virus Genes 2023; 59:817-822. [PMID: 37796410 DOI: 10.1007/s11262-023-02030-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2023] [Accepted: 08/30/2023] [Indexed: 10/06/2023]
Abstract
Rabies is worldwide zoonosis caused by Lyssavirus rabies (RABV) a RNA negative sense virus with low level of fidelity during replication cycle. Nucleoprotein of RABV is the most conserved between all five proteins of the virus and is the most used gene for phylogenetic and phylogeographic studies. Despite of rabies been very important in Public Health concern, it demands continuous prophylactic care for herbivores with economic interest, such as cattle and horses. The main transmitter of RABV for these animals in Brazil is the hematophagous bats Desmodus rotundus. The aim of this study was to determine the dispersion over time and space of RABV transmitted by D. rotundus. Samples of RABV from the State of São Paulo (SP), Southeast Brazil isolated from the central nervous system (CNS) of cattle, were submitted to RNA extraction, RT-PCR, sequencing and phylogeographic analyzes with BEAST (Bayesian Evolutionary Analysis Sampling Trees) v 2.5 software. Was possible to identify high rate of diversification in starts sublineages of RABV what are correlated with a behavior of D. rotundus, the main transmitter of rabies to cattle. This study also highlights the importance of continuous monitoring of genetic lineages of RABV in Brazil.
Collapse
|
3
|
Chen S. Spatial and temporal dynamic analysis of rabies: A review of current methodologies. GEOSPATIAL HEALTH 2022; 17. [PMID: 36468590 DOI: 10.4081/gh.2022.1139] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Accepted: 11/14/2022] [Indexed: 06/17/2023]
Abstract
Rabies continues to be one of the deadliest, high risk diseases worldwide, posing a severe threat to public health. The lack of human-to-human transmission means that the spread of rabies is not significantly affected by the distribution of humans or migra- tion. Thus, the spatiotemporal dynamic of cases in both wild and domestic animals is an important issue that can result in human cases. This paper gives an overview of the methodologies for the spatial and temporal dynamic analysis of this disease. It introduces the most representative research progress of spatial aggregation, dynamic transmission, spatiotemporal distribution, epidemiologi- cal analysis and application of modelling in the study of rabies transmission in recent years. This overview should be useful for investigating the spatial and temporal dynamics of rabies, as it could help understanding the spread of cases as well as contribute to the development of better prevention and control strategies in ecology and epidemiology.
Collapse
Affiliation(s)
- Shuaicheng Chen
- College of Animal Science and Technology, Shandong Agricultural University.
| |
Collapse
|
4
|
Research Advances on the Interactions between Rabies Virus Structural Proteins and Host Target Cells: Accrued Knowledge from the Application of Reverse Genetics Systems. Viruses 2021; 13:v13112288. [PMID: 34835093 PMCID: PMC8617671 DOI: 10.3390/v13112288] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Revised: 11/07/2021] [Accepted: 11/12/2021] [Indexed: 11/17/2022] Open
Abstract
Rabies is a lethal zoonotic disease caused by lyssaviruses, such as rabies virus (RABV), that results in nearly 100% mortality once clinical symptoms appear. There are no curable drugs available yet. RABV contains five structural proteins that play an important role in viral replication, transcription, infection, and immune escape mechanisms. In the past decade, progress has been made in research on the pathogenicity of RABV, which plays an important role in the creation of new recombinant RABV vaccines by reverse genetic manipulation. Here, we review the latest advances on the interaction between RABV proteins in the infected host and the applied development of rabies vaccines by using a fully operational RABV reverse genetics system. This article provides a background for more in-depth research on the pathogenic mechanism of RABV and the development of therapeutic drugs and new biologics.
Collapse
|
5
|
León B, González SF, Solís LM, Ramírez-Cardoce M, Moreira-Soto A, Cordero-Solórzano JM, Hutter SE, González-Barrientos R, Rupprecht CE. Rabies in Costa Rica - Next Steps Towards Controlling Bat-Borne Rabies After its Elimination in Dogs. THE YALE JOURNAL OF BIOLOGY AND MEDICINE 2021; 94:311-329. [PMID: 34211351 PMCID: PMC8223541] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Rabies is an acute, progressive encephalitis caused by a lyssavirus, with the highest case fatality of any conventional infectious disease. More than 17 different lyssaviruses have been described, but rabies virus is the most widely distributed and important member of the genus. Globally, tens of thousands of human fatalities still occur each year. Although all mammals are susceptible, most human fatalities are caused by the bites of rabid dogs, within lesser developed countries. A global plan envisions the elimination of human rabies cases caused via dogs by the year 2030. The combination of prophylaxis of exposed humans and mass vaccination of dogs is an essential strategy for such success. Regionally, the Americas are well on the way to meet this goal. As one example of achievement, Costa Rica, a small country within Central America, reported the last autochthonous case of human rabies transmitted by a dog at the end of the 1970s. Today, rabies virus transmitted by the common vampire bat, Desmodus rotundus, as well as other wildlife, remains a major concern for humans, livestock, and other animals throughout the region. This review summarizes the historical occurrence of dog rabies and its elimination in Costa Rica, describes the current occurrence of the disease with a particular focus upon affected livestock, discusses the ecology of the vampire bat as the primary reservoir relevant to management, details the clinical characteristics of recent human rabies cases, and provides suggestions for resolution of global challenges posed by this zoonosis within a One Health context.
Collapse
Affiliation(s)
- Bernal León
- Biosecurity Laboratory, Servicio Nacional de Salud
Animal (SENASA), LANASEVE, Heredia, Costa Rica
- Universidad Técnica Nacional (UTN), Quesada, Costa
Rica
| | | | - Lisa Miranda Solís
- Specialist in Pediatric Pathology, Pathology Service,
Children National Hospital, Caja Costarricense de Seguro Social, San José, Costa
Rica
| | - Manuel Ramírez-Cardoce
- Specialist in Infectious Diseases, San Juan de Dios
Hospital, Caja Costarricense de Seguro Social, San José, Costa Rica
| | - Andres Moreira-Soto
- Research Center for Tropical Diseases (CIET), Virology,
Faculty of Microbiology, University of Costa Rica, San José, Costa Rica
- Charité-Universitätsmedizin Berlin, corporate member of
Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute
of Health, Institute of Virology, Berlin, Germany
| | | | - Sabine Elisabeth Hutter
- Coordinator of the National Risk Analysis Program,
Epidemiology Department, SENASA, Ministry of Agriculture, San José, Costa
Rica
- Institute of Food Safety, Food Technology and
Veterinary Public Health, Department for Farm Animals and Veterinary Public
Health University of Veterinary Medicine, Vienna, Austria
| | - Rocío González-Barrientos
- Pathology Area Biosecurity Laboratory, Servicio
Nacional de Salud Animal (SENASA), LANASEVE, Heredia, Costa Rica
- Department of Biomedical Sciences of Anatomic
Pathology, Cornell University, Ithaca, NY, USA
| | | |
Collapse
|
6
|
Camp JV, Schmon E, Krause R, Sixl W, Schmid D, Aberle SW. Genetic Diversity of Puumala orthohantavirus in Rodents and Human Patients in Austria, 2012-2019. Viruses 2021; 13:v13040640. [PMID: 33918083 PMCID: PMC8069475 DOI: 10.3390/v13040640] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2021] [Revised: 04/06/2021] [Accepted: 04/07/2021] [Indexed: 12/14/2022] Open
Abstract
Puumala orthohantavirus (PUUV) has a wide distribution throughout Europe. Distinctive temporal patterns of spillover into the human population are related to population dynamics of the reservoir host, the bank vole (Clethrionomys glareolus). As the rodent host is tied to specific habitats with small individual ranges, PUUV genetic diversity is also highly correlated with geographic distance. Using sequenced portions of viral S and M segments, we determined whether geographic clusters were supported. Human cases of PUUV infections are concentrated in southeastern Austria. We detected four distinct genotypes: two genotypes of the Alpe-Adria (ALAD) lineage typically associated with southeast Europe, and two sublineages of the Central Europe (CE) lineage. One cluster of CE genotypes represents a phylogenetically distinct sublineage compared to previously reported CE clades, and extends the boundary of the CE lineage further south than previously reported.
Collapse
Affiliation(s)
- Jeremy V. Camp
- Center for Virology, Medical University of Vienna, 1090 Vienna, Austria;
| | - Eva Schmon
- Institute of Hospital Hygiene and Microbiology, Styrian Hospital Corporation, 8010 Graz, Austria;
| | - Robert Krause
- Section of Infectious Diseases and Tropical Medicine, Department of Internal Medicine, Medical University of Graz, 8036 Graz, Austria;
| | - Wolfdieter Sixl
- Institute of Hygiene, University of Graz, 8010 Graz, Austria;
| | - Daniela Schmid
- Austrian Agency for Health and Food Safety (AGES), 1090 Vienna, Austria;
| | - Stephan W. Aberle
- Center for Virology, Medical University of Vienna, 1090 Vienna, Austria;
- Correspondence: ; Tel.: +43-1-40160-65555
| |
Collapse
|
7
|
Moser KA, Madebe RA, Aydemir O, Chiduo MG, Mandara CI, Rumisha SF, Chaky F, Denton M, Marsh PW, Verity R, Watson OJ, Ngasala B, Mkude S, Molteni F, Njau R, Warsame M, Mandike R, Kabanywanyi AM, Mahende MK, Kamugisha E, Ahmed M, Kavishe RA, Greer G, Kitojo CA, Reaves EJ, Mlunde L, Bishanga D, Mohamed A, Juliano JJ, Ishengoma DS, Bailey JA. Describing the current status of Plasmodium falciparum population structure and drug resistance within mainland Tanzania using molecular inversion probes. Mol Ecol 2020; 30:100-113. [PMID: 33107096 DOI: 10.1111/mec.15706] [Citation(s) in RCA: 41] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Revised: 09/25/2020] [Accepted: 10/13/2020] [Indexed: 02/05/2023]
Abstract
High-throughput Plasmodium genomic data is increasingly useful in assessing prevalence of clinically important mutations and malaria transmission patterns. Understanding parasite diversity is important for identification of specific human or parasite populations that can be targeted by control programmes, and to monitor the spread of mutations associated with drug resistance. An up-to-date understanding of regional parasite population dynamics is also critical to monitor the impact of control efforts. However, this data is largely absent from high-burden nations in Africa, and to date, no such analysis has been conducted for malaria parasites in Tanzania countrywide. To this end, over 1,000 P. falciparum clinical isolates were collected in 2017 from 13 sites in seven administrative regions across Tanzania, and parasites were genotyped at 1,800 variable positions genome-wide using molecular inversion probes. Population structure was detectable among Tanzanian P. falciparum parasites, approximately separating parasites from the northern and southern districts and identifying genetically admixed populations in the north. Isolates from nearby districts were more likely to be genetically related compared to parasites sampled from more distant districts. Known drug resistance mutations were seen at increased frequency in northern districts (including two infections carrying pfk13-R561H), and additional variants with undetermined significance for antimalarial resistance also varied by geography. Malaria Indicator Survey (2017) data corresponded with genetic findings, including average region-level complexity-of-infection and malaria prevalence estimates. The parasite populations identified here provide important information on extant spatial patterns of genetic diversity of Tanzanian parasites, to which future surveys of genetic relatedness can be compared.
Collapse
Affiliation(s)
- Kara A Moser
- Institute for Global Health and Infectious Diseases, University of North Carolina Chapel Hill, Chapel Hill, NC, USA
| | | | - Ozkan Aydemir
- Department of Pathology and Laboratory Medicine, Brown University, Providence, RI, USA
| | - Mercy G Chiduo
- National Institute for Medical Research, Tanga, Tanzania
| | - Celine I Mandara
- National Institute for Medical Research, Tanga, Tanzania.,Kilimanjaro Christian Medical Centre/Kilimanjaro Christian Medical University College, Moshi, Tanzania
| | - Susan F Rumisha
- National Institute for Medical Research, Dar es Salaam, Tanzania
| | - Frank Chaky
- National Malaria Control Program (NMCP), Dodoma, Tanzania
| | - Madeline Denton
- Institute for Global Health and Infectious Diseases, University of North Carolina Chapel Hill, Chapel Hill, NC, USA
| | - Patrick W Marsh
- Department of Pathology and Laboratory Medicine, Brown University, Providence, RI, USA
| | - Robert Verity
- MRC Centre for Global Infectious Disease Analysis, Department of Infectious Disease Epidemiology, Imperial College London, London, UK
| | - Oliver J Watson
- Department of Pathology and Laboratory Medicine, Brown University, Providence, RI, USA.,MRC Centre for Global Infectious Disease Analysis, Department of Infectious Disease Epidemiology, Imperial College London, London, UK
| | - Billy Ngasala
- Muhimbili University of Health and Allied Sciences, Dar es Salaam, Tanzania
| | - Sigsbert Mkude
- National Malaria Control Program (NMCP), Dodoma, Tanzania
| | | | - Ritha Njau
- World Health Organization Country Office, Dar es Salaam, Tanzania
| | - Marian Warsame
- Gothenburg University, Gothenburg, Sweden.,Global Malaria Programme, World Health Organization, Geneva, Switzerland
| | - Renata Mandike
- National Malaria Control Program (NMCP), Dodoma, Tanzania
| | | | | | - Erasmus Kamugisha
- Catholic University of Health and Allied Sciences/Bugando Medical Centre, Mwanza, Tanzania
| | - Maimuna Ahmed
- Catholic University of Health and Allied Sciences/Bugando Medical Centre, Mwanza, Tanzania
| | - Reginald A Kavishe
- Kilimanjaro Christian Medical Centre/Kilimanjaro Christian Medical University College, Moshi, Tanzania
| | - George Greer
- U.S. President's Malaria Initiative, U.S. Agency for International Development, U.S. Embassy, Dar es Salaam, Tanzania
| | - Chonge A Kitojo
- U.S. President's Malaria Initiative, U.S. Agency for International Development, U.S. Embassy, Dar es Salaam, Tanzania
| | - Erik J Reaves
- U.S. President's Malaria Initiative, U.S. Agency for International Development, U.S. Embassy, Dar es Salaam, Tanzania
| | - Linda Mlunde
- Jhpiego/Boresha Afya Project, Dar es Salaam, Tanzania
| | | | - Ally Mohamed
- National Malaria Control Program (NMCP), Dodoma, Tanzania
| | - Jonathan J Juliano
- Institute for Global Health and Infectious Diseases, University of North Carolina Chapel Hill, Chapel Hill, NC, USA.,Curriculum in Genetics and Molecular Biology, University of North Carolina Chapel Hill, Chapel Hill, NC, USA.,Department of Epidemiology, Gillings School of Global Public Health, Chapel Hill, NC, USA
| | - Deus S Ishengoma
- National Institute for Medical Research, Dar es Salaam, Tanzania.,Faculty of Pharmaceutical Sciences, Monash University, Melbourne, Vic, Australia.,Harvard T.H. Chan School of Public health, Harvard University, Boston, MA, USA
| | - Jeffrey A Bailey
- Department of Pathology and Laboratory Medicine, Brown University, Providence, RI, USA
| |
Collapse
|
8
|
Hill T, Unckless RL. Recurrent evolution of high virulence in isolated populations of a DNA virus. eLife 2020; 9:e58931. [PMID: 33112738 PMCID: PMC7685711 DOI: 10.7554/elife.58931] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2020] [Accepted: 10/28/2020] [Indexed: 12/30/2022] Open
Abstract
Hosts and viruses are constantly evolving in response to each other: as a host attempts to suppress a virus, the virus attempts to evade and suppress the host's immune system. Here, we describe the recurrent evolution of a virulent strain of a DNA virus, which infects multiple Drosophila species. Specifically, we identified two distinct viral types that differ 100-fold in viral titer in infected individuals, with similar differences observed in multiple species. Our analysis suggests that one of the viral types recurrently evolved at least four times in the past ~30,000 years, three times in Arizona and once in another geographically distinct species. This recurrent evolution may be facilitated by an effective mutation rate which increases as each prior mutation increases viral titer and effective population size. The higher titer viral type suppresses the host-immune system and an increased virulence compared to the low viral titer type.
Collapse
Affiliation(s)
- Tom Hill
- The Department of Molecular Biosciences, University of KansasLawrenceUnited States
| | - Robert L Unckless
- The Department of Molecular Biosciences, University of KansasLawrenceUnited States
| |
Collapse
|
9
|
Suleiman MA, Kwaga JK, Okubanjo OO, Abarshi MM, Kia GSN. Molecular study of rabies virus in slaughtered dogs in Billiri and Kaltungo local government areas of Gombe state, Nigeria. Acta Trop 2020; 207:105461. [PMID: 32243880 DOI: 10.1016/j.actatropica.2020.105461] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Revised: 03/22/2020] [Accepted: 03/25/2020] [Indexed: 11/27/2022]
Abstract
Rabies is one of the most dreadful diseases and a major viral zoonosis which has been shown to cause an almost 100% fatality rate in infected victims. It is characterized by acute progressive encephalitis in mammals. This study determined the genotypic characteristics of rabies virus in dogs slaughtered for human consumption based on sequence of a fragment of nucleoprotein gene. Brain tissues were collected from 50 dogs slaughtered in Billiri and Kaltungo Local Government Areas of Gombe State, Nigeria. Direct fluorescent antibody test (DFAT) was used to screen for the presence of rabies virus antigen. Viral RNA isolated from DFAT positive brain tissues were subjected to the reverse transcription polymerase chain reaction (RT-PCR) followed by sequencing of the amplicons. Maximum Likelihood (ML) was used to construct a phylogenetic tree for sequences obtained with 1000 bootstrap replicates. The DFAT detected rabies antigen in 3 (6%) of the 50 dog brain tissues, from which 1 (2%) was positive by RT-PCR. ML phylogeny approach of the nucleotide sequences inferred members as originating lyssavirus genus and dog species. Essentially, MK234794 in this study displayed 99.3% sequence similarity with other related rabies viruses in the Africa 2 cluster (Nigeria, Cameroon, Chad and Niger). Interestingly, MK234794 showed no cluster relation with the Africa 1a, 1b, 3 and Africa 4 clades, respectively. This indicates there is in-country and trans-boundary circulation of the rabies viruses with no co-circulation between the Africa lineages, especially as dogs are continuously being traded due to consumption of dog meat in West Africa. This finding has given additional insight into the molecular epidemiology of rabies virus in Nigeria, therefore providing more baseline information for future design of rabies control programs in the country.
Collapse
|
10
|
Baker L, Matthiopoulos J, Müller T, Freuling C, Hampson K. Optimizing spatial and seasonal deployment of vaccination campaigns to eliminate wildlife rabies. Philos Trans R Soc Lond B Biol Sci 2020; 374:20180280. [PMID: 31104608 DOI: 10.1098/rstb.2018.0280] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Understanding how the spatial deployment of interventions affects elimination time horizons and potential for disease re-emergence has broad application to control programmes targeting human, animal and plant pathogens. We previously developed an epidemiological model that captures the main features of rabies spread and the impacts of vaccination based on detailed records of fox rabies in eastern Germany during the implementation of an oral rabies vaccination (ORV) programme. Here, we use simulations from this fitted model to determine the best vaccination strategy, in terms of spatial placement and timing of ORV efforts, for three epidemiological scenarios representative of current situations in Europe. We found that consecutive and comprehensive twice-yearly vaccinations across all regions rapidly controlled and eliminated rabies and that the autumn campaigns had the greater impact on increasing the probability of elimination. This appears to result from the need to maintain sufficient herd immunity in the face of large birth pulses, as autumn vaccinations reach susceptible juveniles and therefore a larger proportion of the population than spring vaccinations. Incomplete vaccination compromised time to elimination requiring the same or more vaccination effort to meet similar timelines. Our results have important practical implications that could inform policies for rabies containment and elimination in Europe and elsewhere. This article is part of the theme issue 'Modelling infectious disease outbreaks in humans, animals and plants: epidemic forecasting and control'. This theme issue is linked with the earlier issue 'Modelling infectious disease outbreaks in humans, animals and plants: approaches and important themes'.
Collapse
Affiliation(s)
- Laurie Baker
- 1 Boyd Orr Centre for Population and Ecosystem Health, Institute for Biodiversity, Animal Health and Comparative Medicine, University of Glasgow , Glasgow G12 8QQ , UK
| | - Jason Matthiopoulos
- 1 Boyd Orr Centre for Population and Ecosystem Health, Institute for Biodiversity, Animal Health and Comparative Medicine, University of Glasgow , Glasgow G12 8QQ , UK
| | - Thomas Müller
- 2 Institute of Molecular Virology and Cell Biology, Friedrich Loeffler Institute, WHO Collaborating Centre for Rabies Surveillance and Research , 17493 Greifswald - Insel Riems , Germany
| | - Conrad Freuling
- 2 Institute of Molecular Virology and Cell Biology, Friedrich Loeffler Institute, WHO Collaborating Centre for Rabies Surveillance and Research , 17493 Greifswald - Insel Riems , Germany
| | - Katie Hampson
- 1 Boyd Orr Centre for Population and Ecosystem Health, Institute for Biodiversity, Animal Health and Comparative Medicine, University of Glasgow , Glasgow G12 8QQ , UK
| |
Collapse
|
11
|
Bertram MR, Bravo de Rueda C, Garabed R, Dickmu Jumbo S, Moritz M, Pauszek S, Abdoulkadiri S, Rodriguez LL, Arzt J. Molecular Epidemiology of Foot-and-Mouth Disease Virus in the Context of Transboundary Animal Movement in the Far North Region of Cameroon. Front Vet Sci 2018; 5:320. [PMID: 30619901 PMCID: PMC6301994 DOI: 10.3389/fvets.2018.00320] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2018] [Accepted: 11/30/2018] [Indexed: 11/13/2022] Open
Abstract
Transboundary movement of animals is an important mechanism for foot-and-mouth disease virus (FMDV) spread in endemic regions, such as Cameroon. Several transboundary animal trade routes cross the Far North Region of Cameroon, and cattle moved on foot along these routes often come in contact with native (sedentary and transhumant) herds. The purpose of this study was to investigate the role of transboundary trade cattle in the epidemiology of FMDV in the Far North Region of Cameroon. A total of 582 oropharyngeal fluid (OPF) samples were collected from asymptomatic transboundary trade cattle at official border check points and 57 vesicle epithelial tissues were collected from clinically affected native cattle in the Far North Region of Cameroon during 2010-2014. Viral protein 1 (VP1) coding sequences were obtained from 6 OPF samples from transboundary cattle (4 serotype O, 2 serotype SAT2) and 19 epithelial tissue samples from native cattle (7 serotype O, 3 serotype SAT2, 9 serotype A). FMDV serotype O viruses belonged to two topotypes (East Africa-3 and West Africa), and phylogenetic analyses suggested a pattern of continuous transmission in the region. Serotype SAT2 viruses belonged to a single topotype (VII), and phylogenetic analysis suggested a pattern of repeated introductions of different SAT2 lineages in the region. Serotype A viruses belonged to topotype AFRICA/G-IV, and the pattern of transmission was unclear. Spearman rank correlation analysis of VP1 coding sequences obtained in this study from transboundary and native cattle showed a positive correlation between genetic distance and time for serotype O (ρ = 0.71, p = 0.003) and between genetic distance and geographic distance for serotype SAT2 (ρ = 0.54, p = 0.1). These data suggest that transboundary trade cattle participate in the transmission of FMDV in the Far North Region of Cameroon, however the dynamics and direction of transmission could not be determined in this study. Results of this study contribute to the understanding of transboundary FMDV epidemiology in Central Africa and will help to inform control programs in Cameroon and in the region.
Collapse
Affiliation(s)
- Miranda R. Bertram
- Foreign Animal Disease Research Unit, Agricultural Research Service, Department of Agriculture, Plum Island Animal Disease Center (PIADC), Greenport, NY, United States
- Research Participation Program, Plum Island Animal Disease Center, Oak Ridge Institute for Science and Education, Oak Ridge, TN, United States
| | - Carla Bravo de Rueda
- Foreign Animal Disease Research Unit, Agricultural Research Service, Department of Agriculture, Plum Island Animal Disease Center (PIADC), Greenport, NY, United States
- Research Participation Program, Plum Island Animal Disease Center, Oak Ridge Institute for Science and Education, Oak Ridge, TN, United States
| | - Rebecca Garabed
- Department of Veterinary Preventive Medicine, The Ohio State University, Columbus, OH, United States
| | | | - Mark Moritz
- Department of Anthropology, The Ohio State University, Columbus, OH, United States
| | - Steven Pauszek
- Foreign Animal Disease Research Unit, Agricultural Research Service, Department of Agriculture, Plum Island Animal Disease Center (PIADC), Greenport, NY, United States
| | | | - Luis L. Rodriguez
- Foreign Animal Disease Research Unit, Agricultural Research Service, Department of Agriculture, Plum Island Animal Disease Center (PIADC), Greenport, NY, United States
| | - Jonathan Arzt
- Foreign Animal Disease Research Unit, Agricultural Research Service, Department of Agriculture, Plum Island Animal Disease Center (PIADC), Greenport, NY, United States
| |
Collapse
|
12
|
Tian H, Feng Y, Vrancken B, Cazelles B, Tan H, Gill MS, Yang Q, Li Y, Yang W, Zhang Y, Zhang Y, Lemey P, Pybus OG, Stenseth NC, Zhang H, Dellicour S. Transmission dynamics of re-emerging rabies in domestic dogs of rural China. PLoS Pathog 2018; 14:e1007392. [PMID: 30521641 PMCID: PMC6283347 DOI: 10.1371/journal.ppat.1007392] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Accepted: 10/08/2018] [Indexed: 12/17/2022] Open
Abstract
Despite ongoing efforts to control transmission, rabies prevention remains a challenge in many developing countries, especially in rural areas of China where re-emerging rabies is under-reported due to a lack of sustained animal surveillance. By taking advantage of detailed genomic and epidemiological data for the re-emerging rabies outbreak in Yunnan Province, China, collected between 1999 and 2015, we reconstruct the demographic and dispersal history of domestic dog rabies virus (RABV) as well as the dynamics of dog-to-dog and dog-to-human transmission. Phylogeographic analyses reveal a lower diffusion coefficient than previously estimated for dog RABV dissemination in northern Africa. Furthermore, epidemiological analyses reveal transmission rates between dogs, as well as between dogs and humans, lower than estimates for Africa. Finally, we show that reconstructed epidemic history of RABV among dogs and the dynamics of rabid dogs are consistent with the recorded human rabies cases. This work illustrates the benefits of combining phylogeographic and epidemic modelling approaches for uncovering the spatiotemporal dynamics of zoonotic diseases, with both approaches providing estimates of key epidemiological parameters.
Collapse
Affiliation(s)
- Huaiyu Tian
- State Key Laboratory of Remote Sensing Science, College of Global Change and Earth System Science, Beijing Normal University, Beijing, China
- * E-mail: (HT); (HZ); (SD)
| | - Yun Feng
- Yunnan Institute of Endemic Diseases Control and Prevention, Yunnan Provincial Key Laboratory for Zoonosis Control and Prevention, Dali, China
| | - Bram Vrancken
- KU Leuven, Department of Microbiology and Immunology, Rega Institute, Laboratory of Evolutionary and Computational Virology, Leuven, Belgium
| | - Bernard Cazelles
- Institut de Biologie de l’École Normale Supérieure UMR 8197, Eco-Evolutionary Mathematics, École Normale Supérieure, France
- Unité Mixte Internationnale 209, Mathematical and Computational Modeling of Complex Systems, Institut de Recherche pour le Développement et Université Pierre et Marie Curie, Bondy, France
| | - Hua Tan
- School of Biomedical Informatics, the University of Texas Health Science Center at Houston, Houston, Texas, United States of America
| | - Mandev S. Gill
- KU Leuven, Department of Microbiology and Immunology, Rega Institute, Laboratory of Evolutionary and Computational Virology, Leuven, Belgium
| | - Qiqi Yang
- State Key Laboratory of Remote Sensing Science, College of Global Change and Earth System Science, Beijing Normal University, Beijing, China
| | - Yidan Li
- State Key Laboratory of Remote Sensing Science, College of Global Change and Earth System Science, Beijing Normal University, Beijing, China
| | - Weihong Yang
- Yunnan Institute of Endemic Diseases Control and Prevention, Yunnan Provincial Key Laboratory for Zoonosis Control and Prevention, Dali, China
| | - Yuzhen Zhang
- Yunnan Institute of Endemic Diseases Control and Prevention, Yunnan Provincial Key Laboratory for Zoonosis Control and Prevention, Dali, China
| | - Yunzhi Zhang
- Yunnan Institute of Endemic Diseases Control and Prevention, Yunnan Provincial Key Laboratory for Zoonosis Control and Prevention, Dali, China
| | - Philippe Lemey
- KU Leuven, Department of Microbiology and Immunology, Rega Institute, Laboratory of Evolutionary and Computational Virology, Leuven, Belgium
| | - Oliver G. Pybus
- Department of Zoology, University of Oxford, Oxford, United Kingdom
| | - Nils Chr. Stenseth
- Centre for Ecological and Evolutionary Synthesis (CEES), Department of Biosciences, University of Oslo, Blindern, Oslo, Norway
- Ministry of Education Key Laboratory for Earth System Modeling, Department of Earth System Science, Tsinghua University, Beijing, China
| | - Hailin Zhang
- Yunnan Institute of Endemic Diseases Control and Prevention, Yunnan Provincial Key Laboratory for Zoonosis Control and Prevention, Dali, China
- * E-mail: (HT); (HZ); (SD)
| | - Simon Dellicour
- KU Leuven, Department of Microbiology and Immunology, Rega Institute, Laboratory of Evolutionary and Computational Virology, Leuven, Belgium
- Spatial Epidemiology Lab (SpELL), Université Libre de Bruxelles, Bruxelles, Belgium
- * E-mail: (HT); (HZ); (SD)
| |
Collapse
|
13
|
Kozakiewicz CP, Burridge CP, Funk WC, VandeWoude S, Craft ME, Crooks KR, Ernest HB, Fountain‐Jones NM, Carver S. Pathogens in space: Advancing understanding of pathogen dynamics and disease ecology through landscape genetics. Evol Appl 2018; 11:1763-1778. [PMID: 30459828 PMCID: PMC6231466 DOI: 10.1111/eva.12678] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Revised: 06/24/2018] [Accepted: 06/28/2018] [Indexed: 12/30/2022] Open
Abstract
Landscape genetics has provided many insights into how heterogeneous landscape features drive processes influencing spatial genetic variation in free-living organisms. This rapidly developing field has focused heavily on vertebrates, and expansion of this scope to the study of infectious diseases holds great potential for landscape geneticists and disease ecologists alike. The potential application of landscape genetics to infectious agents has garnered attention at formative stages in the development of landscape genetics, but systematic examination is lacking. We comprehensively review how landscape genetics is being used to better understand pathogen dynamics. We characterize the field and evaluate the types of questions addressed, approaches used and systems studied. We also review the now established landscape genetic methods and their realized and potential applications to disease ecology. Lastly, we identify emerging frontiers in the landscape genetic study of infectious agents, including recent phylogeographic approaches and frameworks for studying complex multihost and host-vector systems. Our review emphasizes the expanding utility of landscape genetic methods available for elucidating key pathogen dynamics (particularly transmission and spread) and also how landscape genetic studies of pathogens can provide insight into host population dynamics. Through this review, we convey how increasing awareness of the complementarity of landscape genetics and disease ecology among practitioners of each field promises to drive important cross-disciplinary advances.
Collapse
Affiliation(s)
| | | | - W. Chris Funk
- Department of BiologyGraduate Degree Program in EcologyColorado State UniversityFort CollinsColorado
| | - Sue VandeWoude
- Department of Microbiology, Immunology, and PathologyColorado State UniversityFort CollinsColorado
| | - Meggan E. Craft
- Department of Veterinary Population MedicineUniversity of MinnesotaSt. PaulMinnesota
| | - Kevin R. Crooks
- Department of Fish, Wildlife, and Conservation BiologyColorado State UniversityFort CollinsColorado
| | - Holly B. Ernest
- Wildlife Genomics and Disease Ecology LaboratoryDepartment of Veterinary SciencesUniversity of WyomingLaramieWyoming
| | | | - Scott Carver
- School of Natural SciencesUniversity of TasmaniaHobartTasmaniaAustralia
| |
Collapse
|
14
|
Saxenhofer M, Weber de Melo V, Ulrich RG, Heckel G. Revised time scales of RNA virus evolution based on spatial information. Proc Biol Sci 2018; 284:rspb.2017.0857. [PMID: 28794221 DOI: 10.1098/rspb.2017.0857] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2017] [Accepted: 07/06/2017] [Indexed: 12/18/2022] Open
Abstract
The time scales of pathogen evolution are of major concern in the context of public and veterinary health, epidemiology and evolutionary biology. Dating the emergence of a pathogen often relies on estimates of evolutionary rates derived from nucleotide sequence data. For many viruses, this has yielded estimates of evolutionary origins only a few hundred years in the past. Here we demonstrate through the incorporation of geographical information from virus sampling that evolutionary age estimates of two European hantaviruses are severely underestimated because of pervasive mutational saturation of nucleotide sequences. We detected very strong relationships between spatial distance and genetic divergence for both Puumala and Tula hantavirus-irrespective of whether nucleotide or derived amino acid sequences were analysed. Extrapolations from these relationships dated the emergence of these viruses most conservatively to at least 3700 and 2500 years ago, respectively. Our minimum estimates for the age of these hantaviruses are ten to a hundred times older than results from current non-spatial methods, and in much better accordance with the biogeography of these viruses and their respective hosts. Spatial information can thus provide valuable insights on the deeper time scales of pathogen evolution and improve our understanding of disease emergence.
Collapse
Affiliation(s)
- Moritz Saxenhofer
- Computational and Molecular Population Genetics, Institute of Ecology and Evolution, University of Bern, Bern, Switzerland.,Swiss Institute of Bioinformatics, Quartier Sorge-Bâtiment Génopode, Lausanne, Switzerland
| | - Vanessa Weber de Melo
- Computational and Molecular Population Genetics, Institute of Ecology and Evolution, University of Bern, Bern, Switzerland.,Department of Evolutionary Biology and Environmental Studies, University of Zurich, Zurich, Switzerland
| | - Rainer G Ulrich
- Friedrich-Loeffler-Institut, Federal Research Institute for Animal Health, Institute of Novel and Emerging Infectious Diseases, Greifswald-Insel Riems, Germany.,German Center for Infection Research (DZIF), partner site Hamburg-Luebeck-Borstel-Insel Riems, Germany
| | - Gerald Heckel
- Computational and Molecular Population Genetics, Institute of Ecology and Evolution, University of Bern, Bern, Switzerland .,Swiss Institute of Bioinformatics, Quartier Sorge-Bâtiment Génopode, Lausanne, Switzerland
| |
Collapse
|
15
|
Hayman DTS, Fooks AR, Marston DA, Garcia-R JC. The Global Phylogeography of Lyssaviruses - Challenging the 'Out of Africa' Hypothesis. PLoS Negl Trop Dis 2016; 10:e0005266. [PMID: 28036390 PMCID: PMC5231386 DOI: 10.1371/journal.pntd.0005266] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2016] [Revised: 01/12/2017] [Accepted: 12/15/2016] [Indexed: 12/18/2022] Open
Abstract
Rabies virus kills tens of thousands of people globally each year, especially in resource-limited countries. Yet, there are genetically- and antigenically-related lyssaviruses, all capable of causing the disease rabies, circulating globally among bats without causing conspicuous disease outbreaks. The species richness and greater genetic diversity of African lyssaviruses, along with the lack of antibody cross-reactivity among them, has led to the hypothesis that Africa is the origin of lyssaviruses. This hypothesis was tested using a probabilistic phylogeographical approach. The nucleoprotein gene sequences from 153 representatives of 16 lyssavirus species, collected between 1956 and 2015, were used to develop a phylogenetic tree which incorporated relevant geographic and temporal data relating to the viruses. In addition, complete genome sequences from all 16 (putative) species were analysed. The most probable ancestral distribution for the internal nodes was inferred using three different approaches and was confirmed by analysis of complete genomes. These results support a Palearctic origin for lyssaviruses (posterior probability = 0.85), challenging the ‘out of Africa’ hypothesis, and suggest three independent transmission events to the Afrotropical region, representing the three phylogroups that form the three major lyssavirus clades. Rabies virus kills tens of thousands of people globally each year and causes indescribable misery and family disturbance, especially in developing countries. Yet in much of the world there are related viruses, called lyssaviruses, which circulate among bats without causing conspicuous outbreaks. The greater diversity of African lyssaviruses has led to the hypothesis that Africa is the origin of these viruses. To test this hypothesis, the genetic data from 153 representative viruses from 16 available lyssavirus species from across the world dated between 1956 and 2015 were analysed. Statistical models were used to reconstruct the historical processes that lead to the contemporary distribution of these viruses. Our results support a Palearctic origin for lyssaviruses, not Afrotropic, and suggest three independent transmission events to Africa from the Palearctic region.
Collapse
Affiliation(s)
- David T. S. Hayman
- Molecular Epidemiology and Public Health Laboratory, Hopkirk Research Institute, Massey University, Palmerston North, New Zealand
- * E-mail: ,
| | - Anthony R. Fooks
- Wildlife Zoonoses and Vector-borne Diseases Research Group, Animal and Plant Health Agency (APHA), Weybridge-London, United Kingdom
- Department of Clinical Infection, Microbiology & Immunology, Institute of Infection and Global Health, University of Liverpool, Liverpool, United Kingdom
| | - Denise A. Marston
- Wildlife Zoonoses and Vector-borne Diseases Research Group, Animal and Plant Health Agency (APHA), Weybridge-London, United Kingdom
| | - Juan C. Garcia-R
- Molecular Epidemiology and Public Health Laboratory, Hopkirk Research Institute, Massey University, Palmerston North, New Zealand
| |
Collapse
|
16
|
Prediction and Prevention of Parasitic Diseases Using a Landscape Genomics Framework. Trends Parasitol 2016; 33:264-275. [PMID: 27863902 DOI: 10.1016/j.pt.2016.10.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2016] [Revised: 09/10/2016] [Accepted: 10/19/2016] [Indexed: 12/15/2022]
Abstract
Substantial heterogeneity exists in the dispersal, distribution and transmission of parasitic species. Understanding and predicting how such features are governed by the ecological variation of landscape they inhabit is the central goal of spatial epidemiology. Genetic data can further inform functional connectivity among parasite, host and vector populations in a landscape. Gene flow correlates with the spread of epidemiologically relevant phenotypes among parasite and vector populations (e.g., virulence, drug and pesticide resistance), as well as invasion and re-invasion risk where parasite transmission is absent due to current or past intervention measures. However, the formal integration of spatial and genetic data ('landscape genetics') is scarcely ever applied to parasites. Here, we discuss the specific challenges and practical prospects for the use of landscape genetics and genomics to understand the biology and control of parasitic disease and present a practical framework for doing so.
Collapse
|
17
|
Parratt SR, Numminen E, Laine AL. Infectious Disease Dynamics in Heterogeneous Landscapes. ANNUAL REVIEW OF ECOLOGY EVOLUTION AND SYSTEMATICS 2016. [DOI: 10.1146/annurev-ecolsys-121415-032321] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Infectious diseases dynamics are affected by both spatial and temporal heterogeneity in their environments. Our ability to quantify and predict how this heterogeneity impacts risks of infection and disease emergence is the key to successful disease prevention efforts. Here, we review the literature on infectious diseases from human, agricultural, and wildlife ecosystems to describe the rapid ecological and evolutionary responses in pathogens to environmental heterogeneity, with expected impacts on their epidemiology. To date, the underlying network structures through which disease transmission proceeds have been notoriously difficult to quantify because of this variation. We show that with recent advances in statistical methods and genomic approaches, it is now more feasible than ever to trace disease transmission networks, the molecular underpinning of infection, and the environmental variation relevant to disease dynamics. We end by identifying major new opportunities and challenges in understanding disease dynamics in an ever-changing world.
Collapse
Affiliation(s)
- Steven R. Parratt
- Metapopulation Research Centre, Department of Biosciences, University of Helsinki, FI-00014 Helsinki, Finland;, ,
| | - Elina Numminen
- Metapopulation Research Centre, Department of Biosciences, University of Helsinki, FI-00014 Helsinki, Finland;, ,
| | - Anna-Liisa Laine
- Metapopulation Research Centre, Department of Biosciences, University of Helsinki, FI-00014 Helsinki, Finland;, ,
| |
Collapse
|
18
|
Pybus OG, Tatem AJ, Lemey P. Virus evolution and transmission in an ever more connected world. Proc Biol Sci 2015; 282:20142878. [PMID: 26702033 PMCID: PMC4707738 DOI: 10.1098/rspb.2014.2878] [Citation(s) in RCA: 80] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Accepted: 04/15/2015] [Indexed: 01/03/2023] Open
Abstract
The frequency and global impact of infectious disease outbreaks, particularly those caused by emerging viruses, demonstrate the need for a better understanding of how spatial ecology and pathogen evolution jointly shape epidemic dynamics. Advances in computational techniques and the increasing availability of genetic and geospatial data are helping to address this problem, particularly when both information sources are combined. Here, we review research at the intersection of evolutionary biology, human geography and epidemiology that is working towards an integrated view of spatial incidence, host mobility and viral genetic diversity. We first discuss how empirical studies have combined viral spatial and genetic data, focusing particularly on the contribution of evolutionary analyses to epidemiology and disease control. Second, we explore the interplay between virus evolution and global dispersal in more depth for two pathogens: human influenza A virus and chikungunya virus. We discuss the opportunities for future research arising from new analyses of human transportation and trade networks, as well as the associated challenges in accessing and sharing relevant spatial and genetic data.
Collapse
Affiliation(s)
- Oliver G Pybus
- Department of Zoology, University of Oxford, South Parks Road, Oxford OX1 3PS, UK
| | - Andrew J Tatem
- Department of Geography and Environment, University of Southampton, Highfield, Southampton SO17 1BJ, UK Fogarty International Center, National Institutes of Health, Bethesda, MA, USA Flowminder Foundation, Stockholm, Sweden
| | - Philippe Lemey
- Department of Microbiology and Immunology, Rega Institute, KU Leuven-University of Leuven, Leuven, Belgium
| |
Collapse
|
19
|
Brunker K, Marston DA, Horton DL, Cleaveland S, Fooks AR, Kazwala R, Ngeleja C, Lembo T, Sambo M, Mtema ZJ, Sikana L, Wilkie G, Biek R, Hampson K. Elucidating the phylodynamics of endemic rabies virus in eastern Africa using whole-genome sequencing. Virus Evol 2015; 1:vev011. [PMID: 27774283 PMCID: PMC5014479 DOI: 10.1093/ve/vev011] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Many of the pathogens perceived to pose the greatest risk to humans are viral zoonoses, responsible for a range of emerging and endemic infectious diseases. Phylogeography is a useful tool to understand the processes that give rise to spatial patterns and drive dynamics in virus populations. Increasingly, whole-genome information is being used to uncover these patterns, but the limits of phylogenetic resolution that can be achieved with this are unclear. Here, whole-genome variation was used to uncover fine-scale population structure in endemic canine rabies virus circulating in Tanzania. This is the first whole-genome population study of rabies virus and the first comprehensive phylogenetic analysis of rabies virus in East Africa, providing important insights into rabies transmission in an endemic system. In addition, sub-continental scale patterns of population structure were identified using partial gene data and used to determine population structure at larger spatial scales in Africa. While rabies virus has a defined spatial structure at large scales, increasingly frequent levels of admixture were observed at regional and local levels. Discrete phylogeographic analysis revealed long-distance dispersal within Tanzania, which could be attributed to human-mediated movement, and we found evidence of multiple persistent, co-circulating lineages at a very local scale in a single district, despite on-going mass dog vaccination campaigns. This may reflect the wider endemic circulation of these lineages over several decades alongside increased admixture due to human-mediated introductions. These data indicate that successful rabies control in Tanzania could be established at a national level, since most dispersal appears to be restricted within the confines of country borders but some coordination with neighbouring countries may be required to limit transboundary movements. Evidence of complex patterns of rabies circulation within Tanzania necessitates the use of whole-genome sequencing to delineate finer scale population structure that can that can guide interventions, such as the spatial scale and design of dog vaccination campaigns and dog movement controls to achieve and maintain freedom from disease.
Collapse
Affiliation(s)
- Kirstyn Brunker
- Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow G12 8QQ, UK; The Boyd Orr Centre for Population and Ecosystem Health, University of Glasgow, Glasgow G12 8QQ, UK; Animal and Plant Health Agency, Weybridge, Woodham Lane, KT15 3NB, UK
| | - Denise A Marston
- Animal and Plant Health Agency, Weybridge, Woodham Lane, KT15 3NB, UK
| | - Daniel L Horton
- Animal and Plant Health Agency, Weybridge, Woodham Lane, KT15 3NB, UK; School of Veterinary Medicine, University of Surrey, Guildford GU2 7XH, UK
| | - Sarah Cleaveland
- Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow G12 8QQ, UK; The Boyd Orr Centre for Population and Ecosystem Health, University of Glasgow, Glasgow G12 8QQ, UK
| | - Anthony R Fooks
- Animal and Plant Health Agency, Weybridge, Woodham Lane, KT15 3NB, UK
| | - Rudovick Kazwala
- Department of Veterinary Medicine and Public Health, Sokoine University of Agriculture, Morogoro, United Republic of Tanzania
| | - Chanasa Ngeleja
- Tanzania Veterinary Laboratory Agency, Dar es Salaam, United Republic of Tanzania, Temeke Veterinary, Mandela Road, P.O. BOX 9254
| | - Tiziana Lembo
- Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow G12 8QQ, UK; The Boyd Orr Centre for Population and Ecosystem Health, University of Glasgow, Glasgow G12 8QQ, UK
| | - Maganga Sambo
- Ifakara Health Institute, Ifakara, United Republic of Tanzania, P.O. Box 53
| | - Zacharia J Mtema
- Ifakara Health Institute, Ifakara, United Republic of Tanzania, P.O. Box 53
| | - Lwitiko Sikana
- Ifakara Health Institute, Ifakara, United Republic of Tanzania, P.O. Box 53
| | - Gavin Wilkie
- MRC Centre for Virus Research, University of Glasgow, Sir Michael Stoker Building, Garscube Campus, 464 Bearsden Road, Glasgow G61 1QH, UK
| | - Roman Biek
- Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow G12 8QQ, UK; The Boyd Orr Centre for Population and Ecosystem Health, University of Glasgow, Glasgow G12 8QQ, UK
| | - Katie Hampson
- Institute of Biodiversity, Animal Health and Comparative Medicine, University of Glasgow, Glasgow G12 8QQ, UK; The Boyd Orr Centre for Population and Ecosystem Health, University of Glasgow, Glasgow G12 8QQ, UK
| |
Collapse
|
20
|
Bozick BA, Real LA. The Role of Human Transportation Networks in Mediating the Genetic Structure of Seasonal Influenza in the United States. PLoS Pathog 2015; 11:e1004898. [PMID: 26086273 PMCID: PMC4472840 DOI: 10.1371/journal.ppat.1004898] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2014] [Accepted: 04/20/2015] [Indexed: 01/17/2023] Open
Abstract
Recent studies have demonstrated the importance of accounting for human mobility networks when modeling epidemics in order to accurately predict spatial dynamics. However, little is known about the impact these movement networks have on the genetic structure of pathogen populations and whether these effects are scale-dependent. We investigated how human movement along the aviation and commuter networks contributed to intra-seasonal genetic structure of influenza A epidemics in the continental United States using spatially-referenced hemagglutinin nucleotide sequences collected from 2003–2013 for both the H3N2 and H1N1 subtypes. Comparative analysis of these transportation networks revealed that the commuter network is highly spatially-organized and more heavily traveled than the aviation network, which instead is characterized by high connectivity between all state pairs. We found that genetic distance between sequences often correlated with distance based on interstate commuter network connectivity for the H1N1 subtype, and that this correlation was not as prevalent when geographic distance or aviation network connectivity distance was assessed against genetic distance. However, these patterns were not as apparent for the H3N2 subtype at the scale of the continental United States. Finally, although sequences were spatially referenced at the level of the US state of collection, a community analysis based on county to county commuter connections revealed that commuting communities did not consistently align with state geographic boundaries, emphasizing the need for the greater availability of more specific sequence location data. Our results highlight the importance of utilizing host movement data in characterizing the underlying genetic structure of pathogen populations and demonstrate a need for a greater understanding of the differential effects of host movement networks on pathogen transmission at various spatial scales. The rapid, long-distance spread of human pathogens such as seasonal influenza A across modern transportation networks presents a tremendous challenge for public health. Previous work based on influenza-like illness reports has demonstrated that commuters play an important role in the transmission of influenza across the United States. However, genetic structuring of influenza populations within a single season has not previously been detected. Here, we use sequence data collected over multiple seasons to investigate how human movement along the aviation and commuter networks in the United States contributes to influenza transmission at the regional scale. We confirm that commuters can play an integral role in interstate influenza transmission, but found that this pattern was specific to the influenza A subtype under investigation. We additionally show that strong county-to-county commuter flows do not necessarily fall within state boundaries, emphasizing the need for more precise spatial data to be associated with publically available sequences. Our results demonstrate that genetic structure does exist for influenza populations during the course of a single season at the regional scale and highlight the need to incorporate host movement patterns when studying spatial population structure.
Collapse
Affiliation(s)
- Brooke A. Bozick
- Population Biology, Ecology, and Evolution Program, Emory University, Atlanta, Georgia, United States of America
- Center for Disease Ecology, Emory University, Atlanta, Georgia, United States of America
- * E-mail:
| | - Leslie A. Real
- Center for Disease Ecology, Emory University, Atlanta, Georgia, United States of America
- Department of Biology, Emory University, Atlanta, Georgia, United States of America
| |
Collapse
|
21
|
Fries AC, Nolting JM, Bowman AS, Lin X, Halpin RA, Wester E, Fedorova N, Stockwell TB, Das SR, Dugan VG, Wentworth DE, Gibbs HL, Slemons RD. Spread and persistence of influenza A viruses in waterfowl hosts in the North American Mississippi migratory flyway. J Virol 2015; 89:5371-81. [PMID: 25741003 PMCID: PMC4442537 DOI: 10.1128/jvi.03249-14] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Accepted: 02/23/2015] [Indexed: 11/20/2022] Open
Abstract
UNLABELLED While geographic distance often restricts the spread of pathogens via hosts, this barrier may be compromised when host species are mobile. Migratory waterfowl in the order Anseriformes are important reservoir hosts for diverse populations of avian-origin influenza A viruses (AIVs) and are assumed to spread AIVs during their annual continental-scale migrations. However, support for this hypothesis is limited, and it is rarely tested using data from comprehensive surveillance efforts incorporating both the temporal and spatial aspects of host migratory patterns. We conducted intensive AIV surveillance of waterfowl using the North American Mississippi Migratory Flyway (MMF) over three autumn migratory seasons. Viral isolates (n = 297) from multiple host species were sequenced and analyzed for patterns of gene dispersal between northern staging and southern wintering locations. Using a phylogenetic and nucleotide identity framework, we observed a larger amount of gene dispersal within this flyway rather than between the other three longitudinally identified North American flyways. Across seasons, we observed patterns of regional persistence of diversity for each genomic segment, along with limited survival of dispersed AIV gene lineages. Reassortment increased with both time and distance, resulting in transient AIV constellations. This study shows that within the MMF, AIV gene flow favors spread along the migratory corridor within a season, and also that intensive surveillance during bird migration is important for identifying virus dispersal on time scales relevant to pandemic responsiveness. In addition, this study indicates that comprehensive monitoring programs to capture AIV diversity are critical for providing insight into AIV evolution and ecology in a major natural reservoir. IMPORTANCE Migratory birds are a reservoir for antigenic and genetic diversity of influenza A viruses (AIVs) and are implicated in the spread of virus diversity that has contributed to previous pandemic events. Evidence for dispersal of avian-origin AIVs by migratory birds is rarely examined on temporal scales relevant to pandemic or panzootic threats. Therefore, characterizing AIV movement by hosts within a migratory season is important for implementing effective surveillance strategies. We conducted surveillance following birds along a major North American migratory route and observed that within a migratory season, AIVs rapidly reassorted and gene lineages were dispersed primarily within the migratory corridor. Patterns of regional persistence were observed across seasons for each gene segment. We show that dispersal of AIV gene lineages by migratory birds occurs quickly along migratory routes and that surveillance for AIVs threatening human and animal health should focus attention on these routes.
Collapse
Affiliation(s)
- Anthony C Fries
- Department of Veterinary Preventive Medicine, The Ohio State University, Columbus, Ohio, USA Department of Evolution, Ecology and Organismal Biology, The Ohio State University, Columbus, Ohio, USA
| | - Jacqueline M Nolting
- Department of Veterinary Preventive Medicine, The Ohio State University, Columbus, Ohio, USA
| | - Andrew S Bowman
- Department of Veterinary Preventive Medicine, The Ohio State University, Columbus, Ohio, USA
| | - Xudong Lin
- J. Craig Venter Institute, Virology, Rockville, Maryland, USA
| | | | - Eric Wester
- J. Craig Venter Institute, Virology, Rockville, Maryland, USA
| | - Nadia Fedorova
- J. Craig Venter Institute, Virology, Rockville, Maryland, USA
| | | | - Suman R Das
- J. Craig Venter Institute, Virology, Rockville, Maryland, USA
| | - Vivien G Dugan
- J. Craig Venter Institute, Virology, Rockville, Maryland, USA
| | | | - H Lisle Gibbs
- Department of Evolution, Ecology and Organismal Biology, The Ohio State University, Columbus, Ohio, USA Ohio Biodiversity Conservation Partnership, The Ohio State University, Columbus, Ohio, USA
| | - Richard D Slemons
- Department of Veterinary Preventive Medicine, The Ohio State University, Columbus, Ohio, USA
| |
Collapse
|
22
|
Astorga F, Escobar LE, Poo-Muñoz DA, Medina-Vogel G. Dog ownership, abundance and potential for bat-borne rabies spillover in Chile. Prev Vet Med 2015; 118:397-405. [PMID: 25656549 DOI: 10.1016/j.prevetmed.2015.01.002] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2014] [Revised: 12/31/2014] [Accepted: 01/03/2015] [Indexed: 10/24/2022]
Abstract
Rabies is a viral infectious disease that affects all mammals, including humans. Factors associated with the incidence of rabies include the presence and density of susceptible hosts and potential reservoirs. Currently, Chile is declared free of canine-related rabies, but there is an overpopulation of dogs within the country and an emergence of rabies in bats. Our objectives are to determine potential areas for bat-borne rabies spillover into dog populations expressed as a risk map, and to explore some key features of dog ownership, abundance, and management in Chile. For the risk map, our variables included a dog density surface (dog/km(2)) and a distribution model of bat-borne rabies presence. From literature review, we obtained dog data from 112 municipalities, which represent 33% of the total municipalities (339). At country level, based on previous studies the median human per dog ratio was 4.8, with 64% of houses containing at least one dog, and a median of 0.9 dog per house. We estimate a national median of 5.3 dog/km(2), and a median of 3680 dogs by municipality, from which we estimate a total population of 3.5×10(6) owned dogs. The antirabies vaccination presented a median of 21% of dogs by municipality, and 29% are unrestricted to some degree. Human per dog ratio have a significant (but weak) negative association with human density. Unrestricted dogs have a negative association with human density and income, and a positive association with the number of dogs per house. Considering dog density by municipality, and areas of potential bat-borne rabies occurrence, we found that 163 (∼48%) of Chilean municipalities are at risk of rabies spillover from bats to dogs. Risk areas are concentrated in urban settlements, including Santiago, Chile's capital. To validate the risk map, we included cases of rabies in dogs from the last 27 years; all fell within high-risk areas of our map, confirming the assertive risk prediction. Our results suggest that the use of dog population parameters may be informative to determine risk areas for bat-rabies spillover events. In addition, we confirm that dog abundance is a neglected and emerging public health concern in Chile, particularly within urban areas, which deserves prompt intervention.
Collapse
Affiliation(s)
- F Astorga
- Facultad de Ecología y Recursos Naturales, Universidad Andres Bello, República 252, Santiago, Chile
| | - L E Escobar
- Facultad de Ecología y Recursos Naturales, Universidad Andres Bello, República 252, Santiago, Chile; Center for Global Health and Translational Science, Department of Microbiology and Immunology, State University of New York, Upstate Medical University, Syracuse, NY, USA
| | - D A Poo-Muñoz
- Facultad de Ecología y Recursos Naturales, Universidad Andres Bello, República 252, Santiago, Chile
| | - G Medina-Vogel
- Facultad de Ecología y Recursos Naturales, Universidad Andres Bello, República 252, Santiago, Chile.
| |
Collapse
|
23
|
Thrall PH, Oakeshott JG, Fitt G, Southerton S, Burdon JJ, Sheppard A, Russell RJ, Zalucki M, Heino M, Ford Denison R. Evolution in agriculture: the application of evolutionary approaches to the management of biotic interactions in agro-ecosystems. Evol Appl 2015; 4:200-15. [PMID: 25567968 PMCID: PMC3352559 DOI: 10.1111/j.1752-4571.2010.00179.x] [Citation(s) in RCA: 111] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2010] [Accepted: 11/30/2010] [Indexed: 01/04/2023] Open
Abstract
Anthropogenic impacts increasingly drive ecological and evolutionary processes at many spatio-temporal scales, demanding greater capacity to predict and manage their consequences. This is particularly true for agro-ecosystems, which not only comprise a significant proportion of land use, but which also involve conflicting imperatives to expand or intensify production while simultaneously reducing environmental impacts. These imperatives reinforce the likelihood of further major changes in agriculture over the next 30–40 years. Key transformations include genetic technologies as well as changes in land use. The use of evolutionary principles is not new in agriculture (e.g. crop breeding, domestication of animals, management of selection for pest resistance), but given land-use trends and other transformative processes in production landscapes, ecological and evolutionary research in agro-ecosystems must consider such issues in a broader systems context. Here, we focus on biotic interactions involving pests and pathogens as exemplars of situations where integration of agronomic, ecological and evolutionary perspectives has practical value. Although their presence in agro-ecosystems may be new, many traits involved in these associations evolved in natural settings. We advocate the use of predictive frameworks based on evolutionary models as pre-emptive management tools and identify some specific research opportunities to facilitate this. We conclude with a brief discussion of multidisciplinary approaches in applied evolutionary problems.
Collapse
Affiliation(s)
| | | | - Gary Fitt
- CSIRO Ecosystem Sciences Indooroopilly, Qld, Australia
| | | | | | | | | | - Myron Zalucki
- The University of Queensland, School of Integrative Biology Qld, Australia
| | - Mikko Heino
- Department of Biology, University of Bergen Bergen, Norway
| | - R Ford Denison
- University of Minnesota, Ecology, Evolution, and Behavior St. Paul, MN, USA
| |
Collapse
|
24
|
Edenborough K, Marsh GA. Reverse genetics: Unlocking the secrets of negative sense RNA viral pathogens. World J Clin Infect Dis 2014; 4:16-26. [DOI: 10.5495/wjcid.v4.i4.16] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Revised: 08/29/2014] [Accepted: 09/24/2014] [Indexed: 02/06/2023] Open
Abstract
Negative-sense RNA viruses comprise several zoonotic pathogens that mutate rapidly and frequently emerge in people including Influenza, Ebola, Rabies, Hendra and Nipah viruses. Acute respiratory distress syndrome, encephalitis and vasculitis are common disease outcomes in people as a result of pathogenic viral infection, and are also associated with high case fatality rates. Viral spread from exposure sites to systemic tissues and organs is mediated by virulence factors, including viral attachment glycoproteins and accessory proteins, and their contribution to infection and disease have been delineated by reverse genetics; a molecular approach that enables researchers to experimentally produce recombinant and reassortant viruses from cloned cDNA. Through reverse genetics we have developed a deeper understanding of virulence factors key to disease causation thereby enabling development of targeted antiviral therapies and well-defined live attenuated vaccines. Despite the value of reverse genetics for virulence factor discovery, classical reverse genetic approaches may not provide sufficient resolution for characterization of heterogeneous viral populations, because current techniques recover clonal virus, representing a consensus sequence. In this review the contribution of reverse genetics to virulence factor characterization is outlined, while the limitation of the technique is discussed with reference to new technologies that may be utilized to improve reverse genetic approaches.
Collapse
|
25
|
Carrel M, Patel J, Taylor SM, Janko M, Mwandagalirwa MK, Tshefu AK, Escalante AA, McCollum A, Alam MT, Udhayakumar V, Meshnick S, Emch M. The geography of malaria genetics in the Democratic Republic of Congo: A complex and fragmented landscape. Soc Sci Med 2014; 133:233-41. [PMID: 25459204 DOI: 10.1016/j.socscimed.2014.10.037] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2014] [Revised: 08/27/2014] [Accepted: 10/17/2014] [Indexed: 11/28/2022]
Abstract
Understanding how malaria parasites move between populations is important, particularly given the potential for malaria to be reintroduced into areas where it was previously eliminated. We examine the distribution of malaria genetics across seven sites within the Democratic Republic of Congo (DRC) and two nearby countries, Ghana and Kenya, in order to understand how the relatedness of malaria parasites varies across space, and whether there are barriers to the flow of malaria parasites within the DRC or across borders. Parasite DNA was retrieved from dried blood spots from 7 Demographic and Health Survey sample clusters in the DRC. Malaria genetic characteristics of parasites from Ghana and Kenya were also obtained. For each of 9 geographic sites (7 DRC, 1 Ghana and 1 Kenya), a pair-wise RST statistic was calculated, indicating the genetic distance between malaria parasites found in those locations. Mapping genetics across the spatial extent of the study area indicates a complex genetic landscape, where relatedness between two proximal sites may be relatively high (RST > 0.64) or low (RST < 0.05), and where distal sites also exhibit both high and low genetic similarity. Mantel's tests suggest that malaria genetics differ as geographic distances increase. Principal Coordinate Analysis suggests that genetically related samples are not co-located. Barrier analysis reveals no significant barriers to gene flow between locations. Malaria genetics in the DRC have a complex and fragmented landscape. Limited exchange of genes across space is reflected in greater genetic distance between malaria parasites isolated at greater geographic distances. There is, however, evidence for close genetic ties between distally located sample locations, indicating that movement of malaria parasites and flow of genes is being driven by factors other than distance decay. This research demonstrates the contributions that spatial disease ecology and landscape genetics can make to understanding the evolutionary dynamics of infectious diseases.
Collapse
Affiliation(s)
- Margaret Carrel
- Department of Geographical & Sustainability Sciences, University of Iowa, Iowa City, IA, USA.
| | - Jaymin Patel
- Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina- Chapel Hill Chapel Hill, NC, USA
| | - Steve M Taylor
- Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina- Chapel Hill Chapel Hill, NC, USA; Division of Infectious Diseases and International Health, Duke University Medical Center, Durham, NC, USA; Duke Global Health Institute, Durham, NC, USA
| | - Mark Janko
- Department of Geography, University of North Carolina-Chapel Hill, Chapel Hill, NC, USA
| | - Melchior Kashamuka Mwandagalirwa
- Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina- Chapel Hill Chapel Hill, NC, USA
| | - Antoinette K Tshefu
- Ecole de Sante Publique, Faculte de Medecine, University of Kinshasa, Kinshasa, Democratic Republic of the Congo
| | - Ananias A Escalante
- Center for Evolutionary Medicine & Informatics, The Biodesign Institute, Arizona State University, Tempe, AZ, USA
| | - Andrea McCollum
- Malaria Branch, Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Md Tauqeer Alam
- Malaria Branch, Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Venkatachalam Udhayakumar
- Malaria Branch, Division of Parasitic Diseases and Malaria, Center for Global Health, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Steven Meshnick
- Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina- Chapel Hill Chapel Hill, NC, USA
| | - Michael Emch
- Department of Geography, University of North Carolina-Chapel Hill, Chapel Hill, NC, USA
| |
Collapse
|
26
|
Reddy RVC, Mohana Subramanian B, Surendra KSNL, Babu RPA, Rana SK, Manjari KS, Srinivasan VA. Rabies virus isolates of India - simultaneous existence of two distinct evolutionary lineages. INFECTION GENETICS AND EVOLUTION 2014; 27:163-72. [PMID: 25077994 DOI: 10.1016/j.meegid.2014.07.014] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2014] [Revised: 07/09/2014] [Accepted: 07/15/2014] [Indexed: 10/25/2022]
Abstract
Rabies is a fatal viral disease of serious public health implication. The disease is enzootic in India. In the present study, thirty six rabies virus isolates were obtained from terrestrial mammals of India during 2002-2012. Ecto-domain coding region of the glycoprotein gene from all the isolates were sequenced and the phylogenetic analysis was performed in relation to the global rabies and rabies related virus isolates. The Indian isolates grouped into two distinctly separate lineages with majority of the Indian isolates in Arctic like 1 lineage and the remaining isolates in sub-continental lineage. Isolates of the two distinct lineages were identified simultaneously from the same geographical region. Time scaled phylogenetic tree indicated that the sub-continental lineage of the virus is one of the earliest clade of rabies virus that diverged from bat rabies virus. On the contrary, the Arctic-like 1 lineage of India appeared to be a more recent divergence event. The amino acid sequence comparison revealed that all the major antigenic sites were almost conserved among the Indian isolates whereas few amino acid variations could be identified around site IIa, minor site I and IV. The dN/dS study based on G ecto-domain is in support of the earlier reports of strong purifying selection. In conclusion, it is evident that the Indian rabies virus isolates are of two major distinct lineages with distant phylogenetic and evolutionary relationship.
Collapse
Affiliation(s)
- R V Chandrasekhar Reddy
- Research and Development Laboratory, National Dairy Development Board, c/o Indian Immunologicals Limited, Gachibowli, Hyderabad 500032, India; Department of Biotechnology, Acharya Nagarjuna University, Guntur 522510, India
| | - B Mohana Subramanian
- Translational Research Platform for Veterinary Biologicals, Chennai 600051, India
| | - K S N L Surendra
- Research and Development Laboratory, National Dairy Development Board, c/o Indian Immunologicals Limited, Gachibowli, Hyderabad 500032, India
| | - R P Aravindh Babu
- Translational Research Platform for Veterinary Biologicals, Chennai 600051, India; National Institute of Animal Biotechnology, Miyapur, Hyderabad 500049, India
| | - S K Rana
- Research and Development Laboratory, National Dairy Development Board, c/o Indian Immunologicals Limited, Gachibowli, Hyderabad 500032, India
| | - K Sunitha Manjari
- Bioinformatics Group, Centre for Development of Advanced Computing, Pune 411007, India
| | - V A Srinivasan
- Advisor (Animal Health), National Dairy Development Board, 33, Telecom nagar, Gachibowli, Hyderabad 500032, India.
| |
Collapse
|
27
|
Coletta-Filho HD, Francisco CS, Almeida RPP. Temporal and spatial scaling of the genetic structure of a vector-borne plant pathogen. PHYTOPATHOLOGY 2014; 104:120-5. [PMID: 24397266 DOI: 10.1094/phyto-06-13-0154-r] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The ecology of plant pathogens of perennial crops is affected by the long-lived nature of their immobile hosts. In addition, changes to the genetic structure of pathogen populations may affect disease epidemiology and management practices; examples include local adaptation of more fit genotypes or introduction of novel genotypes from geographically distant areas via human movement of infected plant material or insect vectors. We studied the genetic structure of Xylella fastidiosa populations causing disease in sweet orange plants in Brazil at multiple scales using fast-evolving molecular markers (simple-sequence DNA repeats). Results show that populations of X. fastidiosa were regionally isolated, and that isolation was maintained for populations analyzed a decade apart from each other. However, despite such geographic isolation, local populations present in year 2000 were largely replaced by novel genotypes in 2009 but not as a result of migration. At a smaller spatial scale (individual trees), results suggest that isolates within plants originated from a shared common ancestor. In summary, new insights on the ecology of this economically important plant pathogen were obtained by sampling populations at different spatial scales and two different time points.
Collapse
|
28
|
Saito M, Oshitani H, Orbina JRC, Tohma K, de Guzman AS, Kamigaki T, Demetria CS, Manalo DL, Miranda MEG, Noguchi A, Inoue S, Quiambao BP. Genetic diversity and geographic distribution of genetically distinct rabies viruses in the Philippines. PLoS Negl Trop Dis 2013; 7:e2144. [PMID: 23593515 PMCID: PMC3617229 DOI: 10.1371/journal.pntd.0002144] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2012] [Accepted: 02/15/2013] [Indexed: 11/15/2022] Open
Abstract
Background Rabies continues to be a major public health problem in the Philippines, where 200–300 human cases were reported annually between 2001 and 2011. Understanding the phylogeography of rabies viruses is important for establishing a more effective and feasible control strategy. Methods We performed a molecular analysis of rabies viruses in the Philippines using rabied animal brain samples. The samples were collected from 11 of 17 regions, which covered three island groups (Luzon, Visayas, and Mindanao). Partial nucleoprotein (N) gene sequencing was performed on 57 samples and complete glycoprotein (G) gene sequencing was performed on 235 samples collected between 2004 and 2010. Results The Philippine strains of rabies viruses were included in a distinct phylogenetic cluster, previously named Asian 2b, which appeared to have diverged from the Chinese strain named Asian 2a. The Philippine strains were further divided into three major clades, which were found exclusively in different island groups: clades L, V, and M in Luzon, Visayas, and Mindanao, respectively. Clade L was subdivided into nine subclades (L1–L9) and clade V was subdivided into two subclades (V1 and V2). With a few exceptions, most strains in each subclade were distributed in specific geographic areas. There were also four strains that were divided into two genogroups but were not classified into any of the three major clades, and all four strains were found in the island group of Luzon. Conclusion We detected three major clades and two distinct genogroups of rabies viruses in the Philippines. Our data suggest that viruses of each clade and subclade evolved independently in each area without frequent introduction into other areas. An important implication of these data is that geographically targeted dog vaccination using the island group approach may effectively control rabies in the Philippines. Rabies continues to be a major public health problem in the Philippines. We conducted a molecular epidemiological study of rabies using the complete glycoprotein (G) gene from 235 animal brain samples collected in the Philippines between 2004 and 2010. We identified three major clades and two distinct genogroups in the Philippines. The three major clades L, V, and M were found specifically in the Luzon, Visayas, and Mindanao island groups, respectively. Additionally, two minor genogroups were located in the Luzon island group. These data suggest that although human mediated transmission may have occurred, these virus clades evolved independently after a single introduction into each island group. All of the analyzed Philippine strains were clustered into Asian 2b, which diverged from the Chinese strain Asian 2a. No recent introduction of rabies into the Philippines from other countries was apparent. The elimination of rabies by 2020 is a national goal in the Philippines, necessitating urgent development of a more effective and feasible strategy for controlling rabies. Our findings indicate that a geographically targeted dog vaccination campaign may effectively control rabies in island nations such as the Philippines.
Collapse
Affiliation(s)
- Mariko Saito
- Tohoku University Graduate School of Medicine, Sendai City, Miyagi, Japan.
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
29
|
Duke-Sylvester SM, Biek R, Real LA. Molecular evolutionary signatures reveal the role of host ecological dynamics in viral disease emergence and spread. Philos Trans R Soc Lond B Biol Sci 2013; 368:20120194. [PMID: 23382419 DOI: 10.1098/rstb.2012.0194] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
RNA viruses account for numerous emerging and perennial infectious diseases, and are characterized by rapid rates of molecular evolution. The ecological dynamics of most emerging RNA viruses are still poorly understood and difficult to ascertain. The availability of genome sequence data for many RNA viruses, in principle, could be used to infer ecological dynamics if changes in population numbers produced a lasting signature within the pattern of genome evolution. As a result, the rapidly emerging phylogeographic structure of a pathogen, shaped by the rise and fall in the number of infections and their spatial distribution, could be used as a surrogate for direct ecological assessments. Based on rabies virus as our example, we use a model combining ecological and evolutionary processes to test whether variation in the rate of host movement results in predictive diagnostic patterns of pathogen genetic structure. We identify several linearizable relationships between host dispersal rate and measures of phylogenetic structure suggesting genetic information can be used to directly infer ecological process. We also find phylogenetic structure may be more revealing than demography for certain ecological processes. Our approach extends the reach of current analytic frameworks for infectious disease dynamics by linking phylogeography back to underlying ecological processes.
Collapse
|
30
|
Faria NR, Suchard MA, Rambaut A, Streicker DG, Lemey P. Simultaneously reconstructing viral cross-species transmission history and identifying the underlying constraints. Philos Trans R Soc Lond B Biol Sci 2013; 368:20120196. [PMID: 23382420 DOI: 10.1098/rstb.2012.0196] [Citation(s) in RCA: 105] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
The factors that determine the origin and fate of cross-species transmission events remain unclear for the majority of human pathogens, despite being central for the development of predictive models and assessing the efficacy of prevention strategies. Here, we describe a flexible Bayesian statistical framework to reconstruct virus transmission between different host species based on viral gene sequences, while simultaneously testing and estimating the contribution of several potential predictors of cross-species transmission. Specifically, we use a generalized linear model extension of phylogenetic diffusion to perform Bayesian model averaging over candidate predictors. By further extending this model with branch partitioning, we allow for distinct host transition processes on external and internal branches, thus discriminating between recent cross-species transmissions, many of which are likely to result in dead-end infections, and host shifts that reflect successful onwards transmission in the new host species. Our approach corroborates genetic distance between hosts as a key determinant of both host shifts and cross-species transmissions of rabies virus in North American bats. Furthermore, our results indicate that geographical range overlap is a modest predictor for cross-species transmission, but not for host shifts. Although our evolutionary framework focused on the multi-host reservoir dynamics of bat rabies virus, it is applicable to other pathogens and to other discrete state transition processes.
Collapse
Affiliation(s)
- Nuno Rodrigues Faria
- Department of Microbiology and Immunology, Rega Institute, KU Leuven, Leuven, Belgium.
| | | | | | | | | |
Collapse
|
31
|
Bryner SF, Rigling D, Brunner PC. Invasion history and demographic pattern of Cryphonectria hypovirus 1 across European populations of the chestnut blight fungus. Ecol Evol 2012; 2:3227-41. [PMID: 23301186 PMCID: PMC3539014 DOI: 10.1002/ece3.429] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2012] [Revised: 10/09/2012] [Accepted: 10/13/2012] [Indexed: 01/16/2023] Open
Abstract
We reconstructed the invasion history of the fungal virus Cryphonectria hypovirus 1 (CHV-1) in Europe, which infects the chestnut blight fungus Cryphonectria parasitica. The pattern of virus evolution was inferred based on nucleotide sequence variation from isolates sampled across a wide area in Europe at different points in time. Phylogeny and time estimates suggested that CHV-1 was introduced together with its fungal host to Europe and that it rapidly colonized the central range along the south facing slopes of the Alps and the north-east facing slopes of the Dinaric Alps. These central populations were the source for two waves of simultaneous invasions toward the southern Balkans and Turkey, as indicated by migration rates. Our results showed that the evolutionary scenarios for CHV-1 and C. parasitica were spatially congruent. As infection with CHV-1 reduces the pathogenicity of C. parasitica toward the chestnut tree, CHV-1 invasions of the newly established C. parasitica populations probably prevented the development of devastating chestnut blight epidemics in Europe. We propose that in this, and supposedly in other pathosystems, geographic, vegetation-related, demographic, economic, and political factors may help explain the correlated invasion pattern of a parasite and its host.
Collapse
Affiliation(s)
- Sarah F Bryner
- WSL Swiss Federal Research Institute CH-8903, Birmensdorf, Switzerland
| | | | | |
Collapse
|
32
|
Integrating the landscape epidemiology and genetics of RNA viruses: rabies in domestic dogs as a model. Parasitology 2012; 139:1899-913. [PMID: 22814380 PMCID: PMC3526958 DOI: 10.1017/s003118201200090x] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Landscape epidemiology and landscape genetics combine advances in molecular techniques, spatial analyses and epidemiological models to generate a more real-world understanding of infectious disease dynamics and provide powerful new tools for the study of RNA viruses. Using dog rabies as a model we have identified how key questions regarding viral spread and persistence can be addressed using a combination of these techniques. In contrast to wildlife rabies, investigations into the landscape epidemiology of domestic dog rabies requires more detailed assessment of the role of humans in disease spread, including the incorporation of anthropogenic landscape features, human movements and socio-cultural factors into spatial models. In particular, identifying and quantifying the influence of anthropogenic features on pathogen spread and measuring the permeability of dispersal barriers are important considerations for planning control strategies, and may differ according to cultural, social and geographical variation across countries or continents. Challenges for dog rabies research include the development of metapopulation models and transmission networks using genetic information to uncover potential source/sink dynamics and identify the main routes of viral dissemination. Information generated from a landscape genetics approach will facilitate spatially strategic control programmes that accommodate for heterogeneities in the landscape and therefore utilise resources in the most cost-effective way. This can include the efficient placement of vaccine barriers, surveillance points and adaptive management for large-scale control programmes.
Collapse
|
33
|
LAM TOMMYTSANYUK, HON CHUNGCHAU, LEMEY PHILIPPE, PYBUS OLIVERG, SHI MANG, TUN HEINMIN, LI JUN, JIANG JINGWEI, HOLMES EDWARDC, LEUNG FREDERICKCHICHING. Phylodynamics of H5N1 avian influenza virus in Indonesia. Mol Ecol 2012; 21:3062-77. [DOI: 10.1111/j.1365-294x.2012.05577.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
|
34
|
Ewers C, Wares JP. Examining an outlier: molecular diversity in the cirripedia. Integr Comp Biol 2012; 52:410-7. [PMID: 22523123 DOI: 10.1093/icb/ics047] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Despite the typical assumption in studies of mitochondrial diversity that such data are useful for approximating population size and demography, studies of sequence diversity in mitochondrial DNA across the Metazoa have shown a surprising excess of rare alleles, a pattern associated either with strong selection or population growth. Previous work has shown that this bias toward an excess of rare alleles is typical across the Crustacea, and in particular, in the Cirripedia (barnacles). Here, we directly evaluate sequence data from studies of barnacle populations to ensure that inclusion of cryptic species is not the cause of this pattern. The results shown here reinforce previous studies that suggest caution in interpreting such patterns of allele frequencies, as they are likely to be influenced both by demographic changes and selection.
Collapse
Affiliation(s)
- C Ewers
- Department of Genetics, University of Georgia, 120 Green Street, Athens, GA 30602, USA.
| | | |
Collapse
|
35
|
Carrel M, Wan XF, Nguyen T, Emch M. Highly pathogenic H5N1 avian influenza viruses exhibit few barriers to gene flow in Vietnam. ECOHEALTH 2012; 9:60-9. [PMID: 22350419 PMCID: PMC3771539 DOI: 10.1007/s10393-012-0749-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/26/2011] [Revised: 01/20/2012] [Accepted: 01/25/2012] [Indexed: 05/13/2023]
Abstract
Locating areas where genetic change is inhibited can illuminate underlying processes that drive evolution of pathogens. The persistence of highly pathogenic H5N1 avian influenza in Vietnam since 2003, and the continuous molecular evolution of Vietnamese avian influenza viruses, indicates that local environmental factors are supportive not only of incidence but also of viral adaptation. This article explores whether gene flow is constant across Vietnam, or whether there exist boundary areas where gene flow exhibits discontinuity. Using a dataset of 125 highly pathogenic H5N1 avian influenza viruses, principal components analysis and wombling analysis are used to indicate the location, magnitude, and statistical significance of genetic boundaries. Results show that a small number of geographically minor boundaries to gene flow in highly pathogenic H5N1 avian influenza viruses exist in Vietnam, but that overall there is little division in genetic exchange. This suggests that differences in genetic characteristics of viruses from one region to another are not the result of barriers to H5N1 viral exchange in Vietnam, and that H5N1 avian influenza is able to spread relatively unimpeded across the country.
Collapse
Affiliation(s)
- Margaret Carrel
- Department of Geography, University of Iowa, Iowa City, IA 52242, USA.
| | | | | | | |
Collapse
|
36
|
Muellner P, Marshall J, Spencer S, Noble A, Shadbolt T, Collins-Emerson J, Midwinter A, Carter P, Pirie R, Wilson D, Campbell D, Stevenson M, French N. Utilizing a combination of molecular and spatial tools to assess the effect of a public health intervention. Prev Vet Med 2011; 102:242-53. [DOI: 10.1016/j.prevetmed.2011.07.011] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
|
37
|
Torres-Pérez F, Palma RE, Hjelle B, Holmes EC, Cook JA. Spatial but not temporal co-divergence of a virus and its mammalian host. Mol Ecol 2011; 20:4109-22. [PMID: 21880089 DOI: 10.1111/j.1365-294x.2011.05241.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Co-divergence between host and parasites suggests that evolutionary processes act across similar spatial and temporal scales. Although there has been considerable work on the extent and correlates of co-divergence of RNA viruses and their mammalian hosts, relatively little is known about the extent to which virus evolution is determined by the phylogeographic history of host species. To test hypotheses related to co-divergence across a variety of spatial and temporal scales, we explored phylogenetic signatures in Andes virus (ANDV) sampled from Chile and its host rodent, Oligoryzomys longicaudatus. ANDV showed strong spatial subdivision, a phylogeographic pattern also recovered in the host using both spatial and genealogical approaches, and despite incomplete lineage sorting. Lineage structure in the virus seemed to be a response to current population dynamics in the host at the spatial scale of ecoregions. However, finer scale analyses revealed contrasting patterns of genetic structure across a latitudinal gradient. As predicted by their higher substitution rates, ANDV showed greater genealogical resolution than the rodent, with topological congruence influenced by the degree of lineage sorting within the host. However, despite these major differences in evolutionary dynamics, the geographic structure of host and virus converged across large spatial scales.
Collapse
Affiliation(s)
- Fernando Torres-Pérez
- Instituto de Biología, Pontificia Universidad Católica de Valparaíso, Valparaíso, Chile.
| | | | | | | | | |
Collapse
|
38
|
Nadin-Davis SA, Real LA. Molecular phylogenetics of the lyssaviruses--insights from a coalescent approach. Adv Virus Res 2011; 79:203-38. [PMID: 21601049 DOI: 10.1016/b978-0-12-387040-7.00011-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Technical improvements over the past 2 decades have enormously facilitated the generation of nucleotide sequence data for lyssavirus collections. These databases are amenable to methods of phylogenetic analysis, which attempt to define the taxonomic structure of this genus and predict the evolutionary relationships of current circulating strains. Coupled with a range of mathematical tools to explore the appropriateness of nucleotide substitution models and test for positive selection, the evolutionary process is being explored in detail. Despite the potential for high viral mutation levels, the operation of purifying selection appears to effectively constrain lyssavirus evolution. The recent development of coalescent theory has provided additional approaches to data analysis whereby the time frame of emergence of viral lineages can be most reliably estimated. Such studies suggest that all currently circulating rabies viruses have emerged within the past 1500 years. Moreover, through the capability of analyzing viral population dynamics and determining patterns of population size variation, coalescent approaches can provide insight into the demographics of viral outbreaks. Whereas human-assisted movement of reservoir host species has clearly facilitated transfer of rabies between continents, topographical landscape features significantly influence the rate and extent of contiguous disease spread. Together with empirical studies on virus diversity, the application of coalescent approaches will help to better understand lyssavirus emergence, evolution, and spread. In particular, such methods are presently facilitating exploration of the factors operating to limit the ability of lyssaviruses to establish new persistent virus-host associations and ultimately control the emergence of new species of this genus.
Collapse
Affiliation(s)
- Susan A Nadin-Davis
- Centre of Expertise for Rabies, Ottawa Laboratory Fallowfield, Canadian Food Inspection Agency, Ottawa, Ontario, Canada
| | | |
Collapse
|
39
|
Rees EE, Pond BA, Tinline RR, Bélanger D. Understanding effects of barriers on the spread and control of rabies. Adv Virus Res 2011; 79:421-47. [PMID: 21601058 DOI: 10.1016/b978-0-12-387040-7.00020-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
This chapter reviews the evidence for the impact of natural and anthropogenic barriers on the spread of rabies using evidence mainly drawn from the epidemics of fox and raccoon variant rabies virus over the past 60 years in North America. Those barriers have both directed and inhibited the spread of rabies and, at a regional scale, have been integrated with rabies control efforts in North America. Few studies have been done, however, to examine how the texture (grain) and configuration of the habitat at finer scales affect rabies control, particularly the massive oral vaccination campaigns in operation along the Atlantic coast and southeastern Canada (Ontario, Québec, New Brunswick). To explore these questions, the authors used stochastic simulation. The model of choice was the Ontario Rabies Model (ORM) adapted for use on the high performance computing resources network in Québec (RQCHP-Réseau québécois de calcul de haute performance; http://rqchp.qc.ca). The combination of the ORM and RQCHP allowed us to run many thousands of experiments to explore interactions between nine landscape grain/configuration combinations and vaccination barriers with varying widths and immunity levels. Our results show that breaches of vaccine barriers increase as the grain size of the landscape increases and as the landscape becomes more structured. We caution that mid levels of vaccination can be counterproductive resulting in rabies persistence rather than control. We also note that our model/computing system has the flexibility and capacity to explore a wide range of questions pertinent to improving the efficacy of rabies control.
Collapse
Affiliation(s)
- Erin E Rees
- Faculté de médecine vétérinaire, Département de pathologie et microbiologie, GREZOSP Université de Montréal, Saint-Hyacinthe, Quebec, Canada
| | | | | | | |
Collapse
|
40
|
Pluciński MM, Starfield R, Almeida RPP. Inferring social network structure from bacterial sequence data. PLoS One 2011; 6:e22685. [PMID: 21829645 PMCID: PMC3148245 DOI: 10.1371/journal.pone.0022685] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2011] [Accepted: 06/28/2011] [Indexed: 11/18/2022] Open
Abstract
Using DNA sequence data from pathogens to infer transmission networks has traditionally been done in the context of epidemics and outbreaks. Sequence data could analogously be applied to cases of ubiquitous commensal bacteria; however, instead of inferring chains of transmission to track the spread of a pathogen, sequence data for bacteria circulating in an endemic equilibrium could be used to infer information about host contact networks. Here, we show—using simulated data—that multilocus DNA sequence data, based on multilocus sequence typing schemes (MLST), from isolates of commensal bacteria can be used to infer both local and global properties of the contact networks of the populations being sampled. Specifically, for MLST data simulated from small-world networks, the small world parameter controlling the degree of structure in the contact network can robustly be estimated. Moreover, we show that pairwise distances in the network—degrees of separation—correlate with genetic distances between isolates, so that how far apart two individuals in the network are can be inferred from MLST analysis of their commensal bacteria. This result has important consequences, and we show an example from epidemiology: how this result could be used to test for infectious origins of diseases of unknown etiology.
Collapse
Affiliation(s)
- Mateusz M Pluciński
- Department of Environmental Science, Policy and Management, University of California, Berkeley, California, United States of America.
| | | | | |
Collapse
|
41
|
Perez A, Alkhamis M, Carlsson U, Brito B, Carrasco-Medanic R, Whedbee Z, Willeberg P. Global animal disease surveillance. Spat Spatiotemporal Epidemiol 2011; 2:135-45. [PMID: 22748173 PMCID: PMC7185519 DOI: 10.1016/j.sste.2011.07.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Development and implementation of global animal disease surveillance has been limited by the lack of information systems that enable near real-time data capturing, sharing, analysis, and related decision- and policy-making. The objective of this paper is to describe requirements for global animal disease surveillance, including design and functionality of tools and methods for visualization and analysis of animal disease data. The paper also explores the potential application of techniques for spatial and spatio-temporal analysis on global animal disease surveillance, including for example, landscape genetics, social network analysis, and Bayesian modeling. Finally, highly pathogenic avian influenza data from Denmark and Sweden are used to illustrate the potential application of a novel system (Disease BioPortal) for data sharing, visualization, and analysis for regional and global surveillance efforts.
Collapse
Affiliation(s)
- A Perez
- Center for Animal Disease Modeling and Surveillance, School of Veterinary Medicine, University of California, Davis, USA.
| | | | | | | | | | | | | |
Collapse
|
42
|
Morand S, Beaudeau F, Cabaret J. Epidemiological Interaction at the Wildlife/Livestock/Human Interface: Can We Anticipate Emerging Infectious Diseases in Their Hotspots? A Framework for Understanding Emerging Diseases Processes in Their Hot Spots. NEW FRONTIERS OF MOLECULAR EPIDEMIOLOGY OF INFECTIOUS DISEASES 2011. [PMCID: PMC7121693 DOI: 10.1007/978-94-007-2114-2_14] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Emerging infectious diseases’ hotspots have been identified as multi-host and multi-pathogen systems often characterized in tropical ecosystems by an extensive wildlife/domestic/human interface. The pathogen communities shared by the wild and domestic populations at this interface reflect the historical epidemiological interactions between them. In a research framework using recent community ecology, evolutionary biology and molecular biology advances, this information can be used to identify potential pathways for future pathogen spill-over initiating the emergence process. In other words, an understanding of the mechanisms of pathogen transmission in a specific ecosystem can provide an interaction network between host populations defined by nodes and edges and characterized by the frequency, intensity and direction of the interactions with a direct input for targeted disease surveillance.
Collapse
Affiliation(s)
- Serge Morand
- , CNRS, IRD, Université Montpellier 2, Institut des Sciences de l'Evolution, Montpellier Cedex 05, 34095 French S.Territ
| | - François Beaudeau
- , Veterinary School-INRA, BP 40706, Unit of Animal Health Management, Nantes Cedex 03, 44307 French S.Territ
| | - Jacques Cabaret
- INRA, BASE, Ecology and Genetics of Para, Nouzilly, 37380 French S.Territ
| |
Collapse
|
43
|
Carnieli P, de Novaes Oliveira R, Macedo CI, Castilho JG. Phylogeography of rabies virus isolated from dogs in Brazil between 1985 and 2006. Arch Virol 2011; 156:1007-12. [PMID: 21327782 DOI: 10.1007/s00705-011-0942-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2010] [Accepted: 01/28/2011] [Indexed: 10/18/2022]
Abstract
To establish the phylogeographic relationships in rabies viruses in Brazil, we studied a dataset retrieved from GenBank consisting of 71 genetic sequences from the coding region of the N gene of rabies viruses isolated in dogs over a period of 22 years. The Bayesian Markov chain Monte Carlo method available in the BEAST package was used with the GTR+G+Г4 evolutionary model in conjunction with the relaxed uncorrelated lognormal molecular clock model and an exponential growth tree prior. A discrete phylogeographic diffusion model was also analyzed using a standard continuous-time Markov chain viewed with Google Earth to provide a spatial projection of the diffusion of genetic lineages based on their phylogeographic relationships. The topology of the time and substitution phylogenetic trees agreed with the spatial dispersal of the lineages. It was possible to infer that the lineages in the southeastern region of Brazil in the 1970s are the closest to the most common recent ancestor and that all the lineages in the midwestern, northern and northeastern regions are more distant. The importance of this study lies in the fact that it can help with the planning of rabies control measures, as dogs continue to be the main reservoir of rabies virus throughout the world.
Collapse
Affiliation(s)
- Pedro Carnieli
- Instituto Pasteur, Av. Paulista 393, 01311-001 São Paulo, SP, Brazil.
| | | | | | | |
Collapse
|
44
|
Bourhy H, Dautry-Varsat A, Hotez PJ, Salomon J. Rabies, still neglected after 125 years of vaccination. PLoS Negl Trop Dis 2010; 4:e839. [PMID: 21152052 PMCID: PMC2994912 DOI: 10.1371/journal.pntd.0000839] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Affiliation(s)
| | | | - Peter J. Hotez
- Sabin Vaccine Institute, Washington, D. C., United States of America
- Department of Microbiology, Immunology, and Tropical Medicine, George Washington University, Washington, D.C., United States of America
| | | |
Collapse
|
45
|
Alda F, Gaitero T, Suárez M, Merchán T, Rocha G, Doadrio I. Evolutionary history and molecular epidemiology of rabbit haemorrhagic disease virus in the Iberian Peninsula and Western Europe. BMC Evol Biol 2010; 10:347. [PMID: 21067589 PMCID: PMC2992527 DOI: 10.1186/1471-2148-10-347] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2010] [Accepted: 11/10/2010] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND Rabbit haemorrhagic disease virus (RHDV) is a highly virulent calicivirus, first described in domestic rabbits in China in 1984. RHDV appears to be a mutant form of a benign virus that existed in Europe long before the first outbreak. In the Iberian Peninsula, the first epidemic in 1988 severely reduced the populations of autochthonous European wild rabbit. To examine the evolutionary history of RHDV in the Iberian Peninsula, we collected virus samples from wild rabbits and sequenced a fragment of the capsid protein gene VP60. These data together with available sequences from other Western European countries, were analyzed following Bayesian Markov chain Monte Carlo methods to infer their phylogenetic relationships, evolutionary rates and demographic history. RESULTS Evolutionary relationships of RHDV revealed three main lineages with significant phylogeographic structure. All lineages seem to have emerged at a common period of time, between ~1875 and ~1976. The Iberian Peninsula showed evidences of genetic isolation, probably due to geographic barriers to gene flow, and was also the region with the youngest MRCA.Overall, demographic analyses showed an initial increase and stabilization of the relative genetic diversity of RHDV, and a subsequent reduction in genetic diversity after the first epidemic breakout in 1984, which is compatible with a decline in effective population size. CONCLUSIONS Results were consistent with the hypothesis that the current Iberian RHDV arose from a single infection between 1869 and 1955 (95% HPD), and rendered a temporal pattern of appearance and extinction of lineages. We propose that the rising positive selection pressure observed throughout the history of RHDV is likely mediated by the host immune system as a consequence of the genetic changes that rendered the virus virulent. Consequently, this relationship is suggested to condition RHDV demographic history.
Collapse
Affiliation(s)
- Fernando Alda
- Dpto. Biodiversidad y Biología Evolutiva, Museo Nacional de Ciencias Naturales (CSIC). José Gutiérrez Abascal 2, 28006 Madrid, Spain
- Instituto de Investigación en Recursos Cinegéticos (CSIC-UCLM-JCCM). Ronda de Toledo s/n, 13071 Ciudad Real, Spain
| | - Tania Gaitero
- Dpto. Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid. Avda. Puerta de Hierro s/n, 28040 Madrid, Spain
| | - Mónica Suárez
- Dpto. Sanidad Animal, Facultad de Veterinaria, Universidad Complutense de Madrid. Avda. Puerta de Hierro s/n, 28040 Madrid, Spain
| | - Tomás Merchán
- Dpto. Ingeniería del Medio Agronómico y Forestal, Universidad de Extremadura. Av. Virgen del Puerto 2, 10600 Plasencia, Spain
| | - Gregorio Rocha
- Dpto. Ingeniería del Medio Agronómico y Forestal, Universidad de Extremadura. Av. Virgen del Puerto 2, 10600 Plasencia, Spain
| | - Ignacio Doadrio
- Dpto. Biodiversidad y Biología Evolutiva, Museo Nacional de Ciencias Naturales (CSIC). José Gutiérrez Abascal 2, 28006 Madrid, Spain
| |
Collapse
|
46
|
Talbi C, Lemey P, Suchard MA, Abdelatif E, Elharrak M, Jalal N, Faouzi A, Echevarría JE, Vazquez Morón S, Rambaut A, Campiz N, Tatem AJ, Holmes EC, Bourhy H. Phylodynamics and human-mediated dispersal of a zoonotic virus. PLoS Pathog 2010; 6:e1001166. [PMID: 21060816 PMCID: PMC2965766 DOI: 10.1371/journal.ppat.1001166] [Citation(s) in RCA: 115] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2010] [Accepted: 09/28/2010] [Indexed: 11/25/2022] Open
Abstract
Understanding the role of humans in the dispersal of predominately animal pathogens is essential for their control. We used newly developed Bayesian phylogeographic methods to unravel the dynamics and determinants of the spread of dog rabies virus (RABV) in North Africa. Each of the countries studied exhibited largely disconnected spatial dynamics with major geo-political boundaries acting as barriers to gene flow. Road distances proved to be better predictors of the movement of dog RABV than accessibility or raw geographical distance, with occasional long distance and rapid spread within each of these countries. Using simulations that bridge phylodynamics and spatial epidemiology, we demonstrate that the contemporary viral distribution extends beyond that expected for RABV transmission in African dog populations. These results are strongly supportive of human-mediated dispersal, and demonstrate how an integrated phylogeographic approach will turn viral genetic data into a powerful asset for characterizing, predicting, and potentially controlling the spatial spread of pathogens. At least 15 million doses of anti-rabies post-exposure prophylaxis are administered annually worldwide, and an estimated 55,000 people die of rabies every year. Over 99% of these deaths occur in developing countries, predominantly in Asia and in Africa where rabies is endemic in domestic dogs. Despite the global health burden due to rabies, little is known about the patterns of the spread of dog rabies in these endemic regions. We used recently developed Bayesian analytical methods to unravel the dynamics and determinants of the spatial diffusion of dog rabies viruses in North Africa based on viral genetic data. Our analysis reveals a combination of restricted spread across administrative borders, the occasional long-distance movement of rabies viruses, and a strong fit between spatial spread of the virus and road distances between localities. Together, these data indicate that by transporting dogs, humans have played a key role in the dispersal of a major animal pathogen. Our studies therefore provide essential new information on the transmission dynamics of rabies in Africa, and in doing so will greatly assist in future intervention strategies.
Collapse
Affiliation(s)
- Chiraz Talbi
- Institut Pasteur, Unit Lyssavirus Dynamics and Host Adaptation, WHO Collaborating Centre for Reference and Research on Rabies, Paris, France
| | - Philippe Lemey
- Rega Institute, Katholieke Universiteit Leuven, Leuven, Belgium
| | - Marc A. Suchard
- Departments of Biomathematics and Human Genetics, David Geffen School of Medicine, and Department of Biostatistics, School of Public Health, University of California, Los Angeles, Los Angeles, California, United States of America
| | - Elbia Abdelatif
- Institut Pasteur d'Algérie, Laboratoire de la Rage, Recherche et Diagnostic, Alger, Algérie
| | | | - Nourlil Jalal
- Institut Pasteur du Maroc, Laboratoire de Virologie Médicale, Casablanca, Maroc
| | - Abdellah Faouzi
- Institut Pasteur du Maroc, Laboratoire de Virologie Médicale, Casablanca, Maroc
| | - Juan E. Echevarría
- Instituto de Salud Carlos III, Servicio de Microbiología Diagnóstica, Madrid, Spain
| | - Sonia Vazquez Morón
- Instituto de Salud Carlos III, Servicio de Microbiología Diagnóstica, Madrid, Spain
| | - Andrew Rambaut
- Institute of Evolutionary Biology, University of Edinburgh, Ashworth Laboratories, Edinburgh, United Kingdom
- Fogarty International Center, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Nicholas Campiz
- Department of Geography, University of Florida, Gainesville, Florida, United States of America
| | - Andrew J. Tatem
- Department of Geography, University of Florida, Gainesville, Florida, United States of America
- Emerging Pathogens Institute, University of Florida, Gainesville, Florida, United States of America
| | - Edward C. Holmes
- Fogarty International Center, National Institutes of Health, Bethesda, Maryland, United States of America
- Center for Infectious Disease Dynamics, Department of Biology, The Pennsylvania State University, University Park, Pennsylvania, United States of America
| | - Hervé Bourhy
- Institut Pasteur, Unit Lyssavirus Dynamics and Host Adaptation, WHO Collaborating Centre for Reference and Research on Rabies, Paris, France
- * E-mail:
| |
Collapse
|
47
|
Padhi A, Moore AT, Brown MB, Foster JE, Pfeffer M, Brown CR. Isolation by distance explains genetic structure of Buggy Creek virus, a bird-associated arbovirus. Evol Ecol 2010. [DOI: 10.1007/s10682-010-9419-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
|
48
|
Abstract
The spread of parasites is inherently a spatial process often embedded in physically complex landscapes. It is therefore not surprising that infectious disease researchers are increasingly taking a landscape genetics perspective to elucidate mechanisms underlying basic ecological processes driving infectious disease dynamics and to understand the linkage between spatially dependent population processes and the geographic distribution of genetic variation within both hosts and parasites. The increasing availability of genetic information on hosts and parasites when coupled to their ecological interactions can lead to insights for predicting patterns of disease emergence, spread and control. Here, we review research progress in this area based on four different motivations for the application of landscape genetics approaches: (i) assessing the spatial organization of genetic variation in parasites as a function of environmental variability, (ii) using host population genetic structure as a means to parameterize ecological dynamics that indirectly influence parasite populations, for example, gene flow and movement pathways across heterogeneous landscapes and the concurrent transport of infectious agents, (iii) elucidating the temporal and spatial scales of disease processes and (iv) reconstructing and understanding infectious disease invasion. Throughout this review, we emphasize that landscape genetic principles are relevant to infection dynamics across a range of scales from within host dynamics to global geographic patterns and that they can also be applied to unconventional 'landscapes' such as heterogeneous contact networks underlying the spread of human and livestock diseases. We conclude by discussing some general considerations and problems for inferring epidemiological processes from genetic data and try to identify possible future directions and applications for this rapidly expanding field.
Collapse
Affiliation(s)
- Roman Biek
- Division of Ecology and Evolutionary Biology, Boyd Orr Centre for Population and Ecosystem Health, University of Glasgow, Glasgow G12 8QQ, UK.
| | | |
Collapse
|
49
|
Barton HD, Gregory AJ, Davis R, Hanlon CA, Wisely SM. Contrasting landscape epidemiology of two sympatric rabies virus strains. Mol Ecol 2010; 19:2725-38. [PMID: 20546130 DOI: 10.1111/j.1365-294x.2010.04668.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Viral strain evolution and disease emergence are influenced by anthropogenic change to the environment. We investigated viral characteristics, host ecology, and landscape features in the rabies-striped skunk disease system of the central Great Plains to determine how these factors interact to influence disease emergence. We amplified portions of the N and G genes of rabies viral RNA from 269 samples extracted from striped skunk brains throughout the distribution of two different rabies strains for which striped skunks were the reservoir. Because the distribution of these two strains overlapped on the landscape and were present in the same host population, we could evaluate how viral properties influenced epidemiological patterns in the area of sympatry. We found that South Central Skunk rabies (SCSK) exhibited intense purifying selection and high infectivity, which are both characteristics of an epizootic virus. Conversely, North Central Skunk rabies (NCSK) exhibited relaxed purifying selection and comparatively lower infectivity, suggesting the presence of an enzootic virus. The host population in the area of sympatry was highly admixed, and skunks among allopatric and sympatric areas had similar effective population sizes. Spatial analysis indicated that landscape features had minimal influence on NCSK movement across the landscape, but those same features were partial barriers to the spread of SCSK. We conclude that NCSK and SCSK have different epidemiological properties that interact differently with both host and landscape features to influence rabies spread in the central Great Plains. We suggest a holistic approach for future studies of emerging infectious diseases that includes studies of viral properties, host characteristics, and spatial features.
Collapse
Affiliation(s)
- Heather D Barton
- Division of Biology, Kansas State University, 116 Ackert Hall, Manhattan, KS 66506, USA
| | | | | | | | | |
Collapse
|
50
|
Wang X, Smole S, DeMaria A, Gilchrist MJ. Factors Associated with Rabid Animals Since the Introduction of Raccoon Rabies Variant in Massachusetts, 1992–2007. Vector Borne Zoonotic Dis 2010; 10:275-81. [DOI: 10.1089/vbz.2009.0002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Xingtai Wang
- Division of Molecular Diagnostics and Virology, William A. Hinton State Laboratory Institute, Boston, Massachusetts
| | - Sandra Smole
- Division of Molecular Diagnostics and Virology, William A. Hinton State Laboratory Institute, Boston, Massachusetts
| | - Alfred DeMaria
- Bureau of Infectious Diseases Prevention, Response, and Services, Boston, Massachusetts
| | | |
Collapse
|