By LAURAN NEERGAARD and MATTHEW PERRONE
A panel of U.S. health advisers has endorsed booster shots for Moderna’s COVID-19 vaccine. The advisers to the Food and Drug Administration voted Thursday to recommend a lower-dose booster shot for seniors and other high-risk groups. Already millions who got their initial Pfizer shots at least six months ago are getting a booster of that brand. The FDA panel will discuss booster shots of Johnson & Johnson vaccine on Friday. Final decisions are expected next week. U.S. officials stress that the priority is to get shots to the 66 million unvaccinated Americans who are eligible.