Roughly 58% of people in the U.S. now have antibodies from previous Covid infection, demonstrating how widespread the virus was during the winter omicron surge.
The presence of antibodies against SARS-CoV-2 suggests that a person has previously been infected with COVID-19 or vaccinated. In the week beginning 28 March 2022, the percentage of adults estimated to have antibodies above a 179 nanograms per millilitre (ng/ml) threshold is: