How do clinical trials work? This video explains the steps, or phases. | National Cancer Institute

37K views · 163 shares | Did you know? Before the U.S. Food and Drug...

Clinical trial results of Pfizer/BioNTech’s Covid-19 vaccine showed 100% efficacy and is well tolerated among 12 to 15 year olds, the companies said. “By the fall, I think there’s a good possibility we’ll be vaccinating teenagers 12 and up," Dr. Peter Hotez says. https://cnn.it/3ftwTU9 | CNN Replay