A certified medical assistant prepares doses of the Pfizer-BioNTech COVID-19 vaccine at a vaccination center at the University of Nevada, Las Vegas. The US took a major step in the pandemic this week by clearing the Pfizer vaccine for youth ages 12-15. (Image via AP Photo/John Locher, File)
This Duke Pediatrician Explains Why the Pfizer Vaccine Is Safe for Kids 12 and Up

Here’s what to know about how the Pfizer vaccine works in adolescents, and what to expect.