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Both Pfizer and Moderna’s Omicron boosters are "bivalent" vaccines, meaning they protect against Omicron BA.5 and BA.4 subvariants and the original SARS-CoV-2 virus. "The goal of a COVID vaccine ...
Two shots of COVID-19 vaccine without an additional booster offer essentially no lasting protection against infection with Omicron, and a coronavirus infection is as effective as a recent booster ...
A 10-state analysis released by the CDC in February found that a COVID booster was 91% effective against hospitalization two months after vaccination as Omicron spread. After four months, however ...
The XEC variant has become the second-most prevalent strain in the country, representing more than 1 in 10 cases, according to data from the Centers for Disease Control and Prevention (CDC). (It ...
In June 2022, Pfizer and Moderna developed bivalent vaccines to protect against the SARS-CoV-2 wild-type and the Omicron variant. The bivalent vaccines are well-tolerated and offer immunity to Omicron superior to previous mRNA vaccines. [268] In September 2022, the United States Food and Drug Administration (FDA) authorized the bivalent vaccines.
Ferrer noted the first fall-and-winter COVID surge occurred before vaccines were widely available, while the second occurred when vaccines did not fully match the variant of the coronavirus that ...
The CDC advised all adults should get the Covid booster shot when they are eligible, a change from earlier advice that some adults could choose to do so. CDC strengthens advice for boosters as ...
On the heels of the nation’s biggest summer COVID surge—test positivity peaked at 17.8% the week ended Aug. 10—help has arrived. The 2024–25 coronavirus vaccines, initially anticipated ...