The U.S. on Wednesday authorized its first update to COVID-19 vaccines with booster doses that target today’s most common omicron strain. Shots could begin within days.
A pharmacist injects a patient with a booster dosage of the Moderna COVID-19 vaccine in Lawrence, Mass.
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, called BA.4 and BA.5, that are considered the most contagious yet.“It really provides the broadest opportunity for protection,” Pfizer vaccine chief Annaliesa Anderson told the AP.
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. Here’s the rub: The original vaccines still offer strong protection against severe disease and death from COVID-19 for most generally healthy people, especially if they got that important first booster dose. It’s not clear just how much more benefit an updated booster will bring — beyond a temporary jump in antibodies capable of fending off an omicron infection.
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