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About Serology Surveillance
Reported coronavirus disease, COVID-19, cases likely represent only a fraction of all SARS-CoV-2, the virus that causes COVID-19 infections. CDC is using information from COVID-19 seroprevalence surveys to learn more about past SARS-CoV-2 infections, often not accounted for in reported cases. Seroprevalence surveys are investigations that involve the use of serology test (also known as antibody tests)to better understand how many SARS-CoV-2 infections have occurred at different points in time, in different locations, and in different populations in the United States.
https://tools.cdc.gov/api/embed/downloader/download.asp?m=403372&c=408543
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