https://apnews.com/2de19cdff021ad11b95c6b67fd5d8617

U.S. health advisers are debating if millions of Americans who received Moderna vaccinations should get a booster shot -- this time, using half the original dose.

Already millions who got their initial Pfizer shots at least six months ago are getting a booster of that brand. Thursday, advisers to the Food and Drug Administration evaluated the evidence that Moderna boosters should be offered, too -- and on Friday, they’ll tackle the same question for those who got Johnson & Johnson’s vaccine.