The updated boosters from Pfizer Inc/BioNTech SE and Moderna helped prevent symptomatic infections against the new XBB\u002Drelated subvariants.
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For the study, researchers reviewed COVID-19 cases from Dec. 1 through Jan. 13, a period in which U.S. circulation of XBB and XBB.1.5 increased. It showed that the updated vaccine helped prevent illness in roughly half of the people who had previously received two to four doses of the original COVID-19 vaccine, CDC said.
Study author Ruth Link-Gelles of the CDC said overall, the vaccines cut the risk of symptomatic infection by about half on a population, but individuals see a different benefit based on their risk factors.
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