COVID-19 Serology Surveillance
CDC is working with state, local, territorial, academic, and commercial partners to better understand COVID-19 in the United States. Serology tests look for antibodies in blood. If antibodies are found, that means there has been a previous infection. Antibodies are proteins that can fight off infections.
About CDC Serology Surveillance
Serology Surveillance Surveys
Guidance on Serology (or Antibody) Testing
About Using COVID-19 Antibody Test