Alliance for Pandemic Preparedness

November 13, 2020

The Change in Seroprevalence in the US plus Puerto Rico between May and September of SARS-CoV-2 Antibody in the Asymptomatic Population

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  • [Pre-print, not peer-reviewed] The prevalence of SARS-CoV-2 antibodies among asymptomatic individuals in the US more than doubled during May to September (3.0% to 6.6%), with the greatest increase observed in younger individuals (< age 20, 7.8%). Antibody prevalence was similar among males and females, but varied by age. Based on the September prevalence, there were an estimated 11.1 million asymptomatic SARS-CoV-2 infections in the US, which was 1.95-times the cumulative number of cases in the US reported to the CDC as of September 1.

Stout et al. (Nov 13, 2020). The Change in Seroprevalence in the US plus Puerto Rico between May and September of SARS-CoV-2 Antibody in the Asymptomatic Population. MedRxiv. https://doi.org/10.1101/2020.11.10.20215145