Extraintestinal infection of Listeria monocytogenes and susceptibility to spontaneous abortion during pregnancy: A systematic review and meta-analysis

Table 1 Characteristics of included studies

Ref.	City	Number of patients		Number of positive culture for L. monocytogenes		Number of hylA positive strains	Frequency of serotypes	Diagnostic method
		Case	Control	Case	Control
Aljicević et al[13], 2005	Bosnia and Herzegovina	30	30	18	8	ND	ND	Serology
Kaur et al[14], 2007	India	61	ND	4	ND	3	ND	Convectional
Saeedi et al[15], 2009	Iran	118	99	9	3	ND	ND	IgG
Jamshidi et al[16], 2009	Iran	250	200	89	35	ND	ND	IgG
Tahery et al[17], 2009	Iran	102	102	82	20	ND	ND	IFA
Nazeri[18], 2011	Iran	512	ND	6	ND	ND	ND	PCR
Lotfollahi et al[19], 2011	Iran	100	ND	9	ND	ND	ND	Convectional
Jahangirisiskht et al[20], 2012	Iran	190	120	9	2	11/107	ND	Convectional
Jahangirsisakht et al[21], 2013	Iran	64	ND	7	ND	10.28	ND	PCR
Shindang et al[22], 2013	Nigeria	200	ND	14	ND	ND	4b (71%); 1/2a (28)	Convectional
Eslami et al[23], 2014	Iran	96	ND	16	ND	16	ND	PCR
Shoukat et al[24], 2014	India	141	ND	4	ND	4	ND	Convectional
Haghroosta et al[25], 2015	Iran	120	60	25	4	ND	ND	IFA
Pourkaveh et al[26], 2016	Iran	317	ND	54	ND	11		PCR
Bobade et al[27], 2016	Nagpur	113	ND	11	ND	11	4b (81%); 1/2b (18%)	PCR
Tajedini et al[28], 2017	Iran	58	ND	21	ND	ND	ND	IFA
Pour et al[29], 2018	Iran	123	ND	28	ND	28	1/2a (50%); 4b (35%)	PCR
Heidari et al[30], 2018	Iran	100	ND	4	ND	4	ND	Convectional
Al-dorri[31], 2018	Iraq	94	ND	11	ND	11	ND	PCR
Ohadi et al[32], 2019	Iran	96	ND	16	ND	16	1/2b (31%); 1/2a (25%); 4b (12.5%)	PCR
Mozaffari et al[33], 2019	Iran	130	100	35	11	ND	ND	IFA
Zahirnia et al[34], 2019	Iran	124	76	31	28	3	ND	PCR
Fall et al[35], 2020	Senegal	43	ND	2	ND	ND	ND	PCR
Al-Mayahi and Jaber[36], 2020	Iraq	90	ND	15	ND	15	ND	PCR

L. monocytogenes: Listeria monocytogenes; PCR: Polymerase chain reaction; ND: Not detected; IFA: Increased femoral anteversion; IgG: Immunoglobulin G.