HealthDay
As of July 16, close to 9 million teens, aged 12 to 17, had received the Pfizer-BioNTech vaccine — the only one okayed for that age group. Among roughly 9,240 reported side effects, 91% were minor, such as soreness near the vaccination site. But 9% were serious, with 4% developing a heart problem known as myocarditis, the CDC reported Friday.