CDC studies: COVID-19 vaccine booster shots needed to blunt omicron

COVID-19 booster shots offer dramatically higher protection to Americans against the fast-spreading omicron variant, according to three sprawling new studies carried out by the U.S. Centers for Disease Control and Prevention released on Friday. The studies, which cover millions of patients nationwide, offer the first widespread scientific review of vaccines and booster...

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CDC Centers for Disease Control and Prevention Pfizer Rochelle Walensky Susan Walsh U.S.