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Widespread availability of commercial assays that detect anti–severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) antibodies has enabled researchers to examine naturally acquired immunity to coronavirus disease 2019 (COVID-19) at the population level. Several studies have found that the SARS-CoV-2 seroprevalence (the percentage of the population with serum containing antibodies that recognize the virus) has remained below 20% even in the most adversely affected areas globally, such as Spain and Italy.1- 3 In this issue of JAMA Internal Medicine, Bajema et al4 contribute new information on the shifting nature of SARS-CoV-2 seroprevalence in the US. The study uses national data to expand on an earlier US Centers for Disease Control and Prevention study of seroprevalence of antibodies to SARS-CoV-2 in 10 US sites.3
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Corresponding Author: Brad Spellberg, MD, 2051 Marengo Street, Los Angeles, CA 90033 (email@example.com).
Published Online: November 24, 2020. doi:10.1001/jamainternmed.2020.7986
Conflict of Interest Disclosures: Dr Spellberg reported personal fees from IQVIA and service on multiple data safety monitoring boards for therapeutics for COVID-19, with no financial interest in the sponsors, products, or outcomes of the trials during the conduct of the study. No other disclosures were reported.
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