And so far, there’s little evidence of waning effectiveness two to three months after people got their shots.
New studies, conducted by researchers at the US Centers for Disease Control and Prevention, are among the first looks at how the bivalent boosters have continued to work in the real world as the virus has evolved. The data shows that the boosters are continuing to offer substantial protection against currently circulating variants.
More people who tested negative had gotten an updated bivalent booster compared with those who tested positive. So far, there’s little evidence of waning effectiveness two to three months after people got their shots. “What we know from past experience is generally that the vaccines protect better against more severe disease. So these are estimates for symptomatic infection and we would expect that similar estimates for hospitalization and death would be higher,” Link-Gelles said.
“What this tells us is that people that had the bivalent vaccine were better protected than people that were up to date previously, had all their monovalent doses and had not gotten the bivalent vaccine,” Link-Gelles said.The CDC said it was able analyze the data and publish it so quickly thanks to the use of a shortcut. Rather than sequencing the genomes of each positive result, the researchers relied on a different marker to distinguish between variants.
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