The omicron booster shots performed better in preventing infections in all adult age groups, with more protection for people who waited longer to get them.
The CDC’s results are based on more than 360,000 symptomatic adults tested for Covid at pharmacies nationwide from Sept. 14 to Nov. 11, when omicron subvariants BA.4 and BA.5 were the dominant strains in the United States.
“That makes sense,” said John Moore, a professor of microbiology and immunology at Weill Cornell Medical College. He noted that studies have shown longer intervals between Covid vaccine doses can lead to higher antibody levels.that people 5 and older get an updated booster at least 2 months after their last dose. People who've recently had Covid should wait until they have recovered from the illness and ended isolation.
The CDC said its study has several limitations, including that vaccination status and medical history were self-reported and may be subject to bias. Previous Covid infections may be underreported, the agency said, and low uptake of the updated boosters could have affected the results.
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