We conducted 3 population-based cross-sectional surveys, at 1-month intervals, to estimate the prevalence and time-trend of severe acute respiratory syndrome coronavirus 2 infection in Puducherry, India. Seropositivity rate increased from 4.9% to 34.5% over 2 months and was 20-fold higher than the number of diagnosed cases of infection.
Keywords: COVID-19; India; Puducherry; SARS; SARS-CoV-2; coronavirus disease; epidemiology; respiratory infections; seroepidemiologic study; severe acute respiratory syndrome; severe acute respiratory syndrome coronavirus 2; viruses; zoonoses.