Seroprevalence of SARS-CoV-2 antibodies in Seattle, Washington: October 2019–April 2020

摘要

Background The first US case of SARS-CoV-2 infection was detected on January 20, 2020. However, some serology studies suggest SARS-CoV-2 may have been present in the United States prior to that, as early as December 2019. The extent of domestic COVID-19 detection prior to 2020 has not been well-characterized.