Rethinking COVID-19 seasonality: A summer respiratory virus in the tropics, contrast to influenza

Figure 1 Year wise severe acute respiratory syndrome coronavirus-2 daily trend graphs. India: Week wise trend of respiratory viral cases; arrows indicate outbreak periods during summer when influenza activity is minimal. Adapted from ICMR[7]. Copyright© ICMR. Material featured on this Website may be reproduced free of charge. However, the material has to be reproduced accurately and not to be used in a derogatory manner or in a misleading context. Wherever the material is being published or issued to others, the source must be prominently acknowledged (Supplementary material).

Figure 2 Behavioral - environmental (agent-host-environmental triad) model describing various possible reasons of coronavirus disease 2019 hemispheric divergence in seasonal peaks. COVID-19: Coronavirus disease 2019; R₀: Basic Reproduction Number; ACE2: Angiotensin-converting enzyme 2; AC: Air conditioner.