About The Study: In this case-control study of 23,000 symptomatic individuals in King County, Washington, from June 2020 to July 2022, estimated risk factors and symptoms associated with SARS-CoV-2 infection changed over time. There was a shift in reported symptoms between the Delta and Omicron variants as well as reductions in the protection provided by vaccines. Racial and sociodemographic disparities persisted in the third year of SARS-CoV-2 circulation and were also present in rhinovirus infection. Trends in testing behavior and availability may influence these results.
Authors: Chelsea Hansen, M.P.H., of the National Institutes of Health in Bethesda, Maryland, is the corresponding author.
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