Updated COVID-19 boosters offer increased protection against new variants in people who have previously received up to four doses of the older vaccine, a new study showed.
-Updated COVID-19 boosters offer increased protection against new coronavirus subvariants in people who have previously received up to four doses of the older vaccine, based on data from the first study to assess how the retooled shots are faring in the real world, U.S. officials said on Tuesday.
The study of more than 360,000 people compared updated boosters from Pfizer/BioNTech and Moderna that target both the original virus and Omicron BA.4/5 coronavirus subvariants with their earlier COVID-19 vaccines. The data was published in the U.S. Centers for Disease Control and Prevention's Morbidity and Mortality Weekly Report.
The latest study showed that the vaccines provided greater benefit to those ages 18-49 than for older adults. Vaccine effectiveness dropped to a range of 28%-31% when the boosters were given just two to three months after previous vaccination.
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