The National Institutes of Health (NIH) is seeking volunteers for a clinical trial to test the effectiveness of a vaccine developed to prevent coronavirus disease 2019 (COVID-19). The trial, which will be conducted at U.S. clinical research sites, is expected to enroll approximately 30,000 adult volunteers who do not have COVID-19. Get more information from a Q&A about the phase 3 trial. You can also watch a 30-minute interview with a volunteer from the phase 1 clinical trial, who is joined by NIH Director Francis Collins and Dr. Anthony Fauci. (Note: the video has some tech difficulties in the beginning).