We investigated what proportion of the population acquired severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) infection and whether the herd immunity threshold has been reached in 10 communities in Qatar. The study included 4,970 participants during June 21–September 9, 2020. Antibodies against SARS-CoV-2 were detected by using an electrochemiluminescence immunoassay. Seropositivity ranged from 54.9% (95% CI 50.2%–59.4%) to 83.8% (95% CI 79.1%–87.7%) across communities and showed a pooled mean of 66.1% (95% CI 61.5%–70.6%). A range of other epidemiologic measures indicated that active infection is rare, with limited if any sustainable infection transmission for clusters to occur. Only 5 infections were ever severe and 1 was critical in these young communities; infection severity rate of 0.2% (95% CI 0.1%–0.4%). Specific communities in Qatar have or nearly reached herd immunity for SARS-CoV-2 infection: 65%–70% of the population has been infected.
【저자키워드】 COVID-19, coronavirus disease, severe acute respiratory syndrome coronavirus 2, viruses, respiratory infections, zoonoses, SARS-CoV-2, coronavirus, Immunity, Epidemiology, Seroprevalence, Infection, herd immunity, communities, craft and manual workers, CMWs, Qatar, 【초록키워드】 coronavirus, SARS-COV-2 infection, severe acute respiratory syndrome Coronavirus, herd immunity, Community, Cluster, Seropositivity, Severity rate, respiratory, Critical, Infection transmission, Herd immunity threshold, acute respiratory syndrome, 95% CI, acute respiratory syndrome coronavirus, acute respiratory syndrome coronavirus 2, measure, participant, electrochemiluminescence immunoassay, Specific, proportion, indicated, investigated, occur, reached, ranged, 【제목키워드】 coronavirus, coronavirus 2, herd immunity, respiratory, Herd,