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 | https://www.cdc.gov/acip/grade/covid-19-pfizer-biontech-vaccine.html#:~:text=1%20Pooled%20efficacy%20and%20effectiveness%20estimates%20were,with%20a%20lower%20risk%20of%20symptomatic%20laboratory%2Dconfirmed | Fri, 08 Aug 2025 06:55:50 GMT | Archived webpage |