The National Institutes of Health launched a study to determine the number of adults in the U.S. without a confirmed COVID-19 history who have antibodies to the virus. By collecting blood samples from volunteers, researchers hope to model the degree to which the virus spread undetected in this country.
More information can be obtained at https://www.nih.gov/news-events/news-releases/nih-begins-study-quantify-undetected-cases-coronavirus-infection.