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Aziz, N Ahmad; Corman, Victor M; Echterhoff, Antje K C; Müller, Marcel A; Richter, Anja; Schmandke, Antonio; Schmidt, Marie Luisa; Schmidt, Thomas H; de Vries, Folgerdiena M; Drosten, Christian; Breteler, Monique M B
Nature communications, 04/2021, Volume: 12, Issue: 1Journal Article
To estimate the seroprevalence and temporal course of SARS-CoV-2 neutralizing antibodies, we embedded a multi-tiered seroprevalence survey within an ongoing community-based cohort study in Bonn, Germany. We first assessed anti-SARS-CoV-2 immunoglobulin G levels with an immunoassay, followed by confirmatory testing of borderline and positive test results with a recombinant spike-based immunofluorescence assay and a plaque reduction neutralization test (PRNT). Those with a borderline or positive immunoassay result were retested after 4 to 5 months. At baseline, 4771 persons participated (88% response rate). Between April 24 and June 30 , 2020, seroprevalence was 0.97% (95% CI: 0.72-1.30) by immunoassay and 0.36% (95% CI: 0.21-0.61) when considering only those with two additional positive confirmatory tests. Importantly, about 20% of PRNT+ individuals lost their neutralizing antibodies within five months. Here, we show that neutralizing antibodies are detectable in only one third of those with a positive immunoassay result, and wane relatively quickly.
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