Greater Boston MA

Study: Pfizer Vaccine Efficacy Against COVID-19 Infections Dropped Over 5 Months

CBS Local Boston

Oct 5, 2021

BOSTON (CBS) -- A new study on the Pfizer vaccine found its efficacy against COVID-19 dropped over the course of five months. The research found the vaccine remained highly effecti…

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Study: Pfizer Vaccine Efficacy Against COVID-19 Infections Dropped Over 5 Months

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