FDA Leans Toward Authorizing Moderna Booster at a Half Dose (4)

The U.S. Food and Drug Administration is leaning toward authorizing half-dose booster shots of the Moderna Inc. coronavirus vaccine, satisfied that it’s effective in shoring up protection, people familiar with the matter said.

The authorization would set the stage to further widen the U.S. booster campaign after earlier authorization of the Pfizer Inc.-BioNTech SE shot. About 170 million fully vaccinated people in the U.S. received the Moderna or Pfizer shots, or 92% of the total inoculated so far.

The people spoke on the condition of anonymity, before a potential announcement. It’s not clear when an announcement will come. ...