Antibody tests look for the presence of antibodies, which are proteins made in response to infections. Antibodies are detected in the blood of people who are tested after infection; they show the body's efforts to fight off a specific infection. In general, a positive antibody test is presumed to mean a person has been infected with SARS-CoV-2, the virus that causes COVID-19, at some point in the past. It does not mean they are currently infected. Antibodies usually start developing within 1 to 3 weeks after infection.
Please click here for details on Antibody Testing from the CDC.
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