A population-based analysis of the longevity of SARS-CoV-2 antibody seropositivity in the United States

Cross-sectional study (39,086 confirmed positive COVID-19 cases) found a seropositivity rate of 68.2% for antibodies targeting the N-protein after 293 days, and 87.8% for antibodies targeting the S-protein at 300 days. Those <65 yrs showed a more sustained seropositivity.

EClinical Medicine