Researchers are trying to learn more about COVID-19 vaccines from original study participants. The quest is hampered because many people who first received a placebo shot are opting for the vaccine. (Image credit: Joe Raedle/Getty Images) Check ou…
Researchers are trying to learn more about COVID-19 vaccines from original study participants. The quest is hampered because many people who first received a placebo shot are opting for the vaccine. (Image credit: Joe Raedle/Getty Images) Check ou…