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Studies show good COVID booster effect, waning 2nd-dose protection

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Several new studies on the Pfizer/BioNTech mRNA COVID-19 vaccine describe good effectiveness against the Delta (B1617.2) variant after a booster dose and high but waning protection against infection and severe illness 6 months after the second dose.Other, much smaller, studies demonstrated the safety of third mRNA vaccine doses.

And a new British study on waning two-dose effectiveness coincides with the recent decision by UK officials to recommend booster doses.Tomorrow, Food and Drug Administration (FDA) advisors will discuss Pfizer's application for the use of booster doses in the United States.Infections 11 times lower after boosterYesterday, the New England Journal of Medicine (NEJM) published three studies, the first of which—led by

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