The FDA has said scientists need to determine what sorts of updates the shots would require by the end of June.
Including an omicron component in the updated boosters"makes sense," said Dr. Anna Durbin, a vaccine researcher at Johns Hopkins University in Baltimore. That's because, she said, a more specific target is needed to generate more antibodies that can attack the omicron variant specifically.
The studies have shown the updated shots produce an improved immune response, but not whether they provide more durable, longer-lasting protection, the people said. Currently, antibodies generated from the existing booster start waning after about four months. John Moore, a professor of microbiology and immunology at Weill Cornell Medical College, has remained skeptical that the bivalent vaccine will provide stronger protection than the existing booster shots.online to a preprint server earlier this year, that suggested an omicron-specific booster may not provide any greater protection compared to the existing booster shots.
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