Pfizer submits data to FDA showing side effects from Covid booster shots are similar to the second dose - CNBC

Side effects from Covid vaccine booster shots are similar to those felt after the second dose and are more likely to affect younger people, Pfizer said in new data submitted to the Food and Drug Administration as it seeks approval to distribute booster shots across the U.S.

Pfizer's phase three study of vaccine booster doses, which included a group of about 300 participants from ages 18 to 55, found that 63.7% experienced fatigue after getting their boosters, 48.4% had headaches and 39.1% felt muscle pain.

The majority of reactions to the booster were mild or moderate in severity, the company said in a 52-page report released by the agency Wednesday.