However, the new booster reduced the risk of death from COVID by more than twofold compared to vaccinated people without it, and by nearly 13-fold for unvaccinated people.
Americans who got their COVID-19 bivalent booster vaccine are not fully protected against getting sick, according to a new report.that said the updated boosters were just 48% effective at preventing symptomatic infection from the XBB.1.5 subvariant for up to three months.for an effective vaccine — meaning the bivalent shots fall just below their benchmark.
Researchers at the CDC compiled data from a government COVID testing initiative conducted between December 1, 2022 through January 13, 2023 — when XBB and XBB.1.5 were the dominant strains — and accounted for symptomatic infection, which is defined by one or more symptoms. Overall, the shot cuts the risk of symptomatic infection by about half of a population, but people will see different results and benefits based on risk factors, said Ruth Link-Gelles, author of the study.
But as COVID continued to mutate and new variants were formed, the shots began to lose their strength.
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