The delta variant now accounts for more than 95% of U.S. cases, according to the CDC, and has led to a rise in the death rate in 43 states, the worst tally since December.
, and soon after the agency and the CDC recommended a third vaccine dose to those who have compromised immune systems. A
Justin Bishop, 13, receives the first dose of the Pfizer-BioNTech COVID-19 vaccine on May 14, 2021, at the Mount Sinai South Nassau Vaxmobile in Freeport, N.Y. The study among health care personnel and other front-line workers was conducted in eight locations across six states beginning in December 2020 and ending Aug. 14. The research shows vaccine effectiveness was 91% before the dominance of the delta variant, and it has since dropped to 66%.
“Although these interim findings suggest a moderate reduction in the effectiveness of COVID-19 vaccines in preventing infection, the sustained two-thirds reduction in infection risk underscores the continued importance and benefits of COVID-19 vaccination,” the CDC said.
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