A March-June 2021 representative serosurvey among Sitakunda subdistrict (Chattogram, Bangladesh) residents found an adjusted prevalence of severe acute respiratory syndrome coronavirus 2 antibodies of 64.1% (95% credible interval 60.0%-68.1%). Before the Delta variant surge, most residents had been infected, although cumulative confirmed coronavirus disease incidence was low.
Keywords: Bangladesh; COVID-19; Delta variant; SARS-CoV-2; coronavirus disease; respiratory infections; seroepidemiologic studies; severe acute respiratory syndrome coronavirus 2; zoonoses.