Moderna and J&J Covid-19 Boosters, Mixing and Matching Authorized by the FDA

U.S. health regulators significantly widened the nation’s Covid-19 booster campaign, clearing use of extra doses of Moderna Inc. and Johnson & Johnson vaccines and also saying people can get a shot that is different from what they had previously received.

The moves, announced by the Food and Drug Administration on Wednesday, will make boosters available to the majority of adults who have been fully vaccinated and have passed the recommended waiting period.