U.S. clears updated COVID-19 boosters targeting newest variants

WASHINGTON >> The U.S. on Wednesday authorized its first update to COVID-19 vaccines, booster doses that target today’s most common omicron strain. Shots could begin within days.

The move by the Food and Drug Administration tweaks the recipe of shots made by Pfizer and rival Moderna that already have saved millions of lives. The hope is that the modified boosters will blunt yet another winter surge — and help tamp down the BA.5 omicron relative that continues to spread widely.

“These updated boosters present us with an opportunity to get ahead” of the next COVID-19 wave, said FDA Commissioner Dr. Robert Califf.

Until now, COVID-19 vaccines have targeted the original coronavirus strain, even as wildly different mutants emerged. The new U.S. boosters are combination, or “bivalent,” shots. They contain half that original vaccine recipe and half protection against the newest omicron versions, BA.4 and BA.5, that are considered the most contagious yet.

The combination aims to increase cross-protection against multiple variants.

“It really provides the broadest opportunity for protection,” Pfizer vaccine chief Annaliesa Anderson said.

The updated boosters are only for people who have already had their primary vaccinations, using the original vaccines. Doses made by Pfizer and its partner BioNTech are for anyone 12 and older while Moderna’s updated shots are for adults — if it has been at least two months since their last primary vaccination or their latest booster. They’re not to be used for initial vaccinations.

There’s one more step before a fall booster campaign begins: The U.S. Centers for Disease Control and Prevention must recommend who should get the additional shot. An influential CDC advisory panel will debate the evidence today — including whether people at high risk from COVID-19 should go first.

The U.S. has purchased more than 170 million doses from the two companies. Pfizer said it could ship up to 15 million of those doses by the end of next week. Moderna didn’t immediately say how many doses are ready to ship but that some will be available “in the coming days.”

The big question is whether people weary of vaccinations will roll up their sleeves again. Just half of vaccinated Americans got the first recommended booster dose, and only a third of those 50 and older who were urged to get a second booster did so.