Herd immunity against severe acute respiratory syndrome coronavirus 2 infection in 10 communities, qatar
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Date
2021Author
Jeremijenko, A.Chemaitelly, H.
Ayoub, H.H.
Alishaq, M.
Abou-Samra, A.-B.
Al Ajmi, J.A.A.A.
Al Ansari, N.A.A.
Al Kanaani, Z.
Al Khal, A.
Al Kuwari, E.
Al-Mohammed, A.
Al Molawi, N.H.A.
Al Naomi, H.M.
Butt, A.A.
Coyle, P.
El Kahlout, R.A.
Gillani, I.
Kaleeckal, A.H.
Masoodi, N.A.
Thomas, A.G.
Nafady-Hego, H.
Latif, A.N.
Shaik, R.M.
Younes, N.B.M.
Abdul Rahim, H.F.
Yassine, H.M.
Al Kuwari, M.G.
Al Romaihi, H.E.
Al-Thani, M.H.
Bertollini, R.
Abu-Raddad, L.J.
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We investigated what proportion of the population acquired severe acute respiratory syndrome coronavirus 2 (SARSCoV- 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%). Specifi c communities in Qatar have or nearly reached herd immunity for SARS-CoV-2 infection: 65%-70% of the population has been infected.
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