Dr. Ofer Levy of Boston Children’s Hospital

AP Newswire reports that the FDA's U.S. health advisers endorsed a booster of Johnson & Johnson’s COVID-19 vaccine Friday, citing concern that Americans who got the single-dose shot aren’t as protected as those given two-dose brands. J&J told the Food and Drug Administration that an extra dose adds important protection as early as two months after initial vaccination — but that it might work better if people wait until six […]