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.
View our interactive dashboard highlighting detailed data for each of the 10 sites surveyed in the latest commercial laboratory seroprevalence study.