COVID-19 vaccines, but only about half of them got the real thing during trials.Now, with the first vaccine rollouts and a surge in coronavirus infections, experts are debating what to do about the half that got a dummy shot.
Coronavirus vaccines: What you should know about the side effects Should everyone now be offered a vaccine? Or should the two groups in the Pfizer and Moderna studies remain intact in order to collect long-term data on how well the vaccines work?“There’s a real tension here,” said Dr.