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Pfizer Booster Shot Lowered Coronavirus Infection Risk in Study

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Pfizer-BioNTech Shot Recommended by CDC Advisory Panel

A third shot of the Pfizer Inc.-BioNTech SE Covid vaccine provides added protection against the coronavirus during a delta outbreak, according to early data from Israel, where boosters began rolling out incrementally in mid-July. 

People who received the supplemental dose had a 48% to 68% lower risk of infection a week to 13 days later, compared to those who got the standard two-dose regimen, a preliminary analysis of data from Maccabi Healthcare Services found. The protection increased with time, with a 70% to 84% reduced risk of testing positive two weeks to 20 days after getting a third shot.