Leyda Valentine, a research coordinator, takes blood from Lisa Taylor as she participates in a COVID-19 vaccination study at Research Centers of America in Hollywood, Fla., in August 2020.

HOLLYWOOD, FLORIDA – AUGUST 07: Leyda Valentine, an assistant coordinator, takes blood from Lisa Taylor as she participates in a COVID-19 vaccination study at Research Centers of America on August 07, 2020 in Hollywood, Florida. Research Centers of America is currently conducting COVID-19 vaccine trials, implemented under the federal government’s Operation Warp Speed program. The center is recruiting volunteers to participate in the clinical trials, working with the Federal Government and major Pharmaceutical Companies, that are racing to develop a vaccine to potentially prevent COVID-19. (Photo by Joe Raedle/Getty Images)