From this page, it sounds like they are mostly looking for people who are likely to encounter the virus, and are in high risk groups: ("For some of the antibod

From this page, it sounds like they are mostly looking for people who are likely to encounter the virus, and are in high risk groups: ("For some of the antibody studies, you will not need to reach out to a site because the study staff will come to the nursing home or assisted living facility."): https://www.coronaviruspreventionnetwork.org/what-to-expect-volunteer/ https://www.coronaviruspreventionnetwork.org/what-to-expect-...