In a study of more than 4,900 health care workers across 33 sites in 25 U.S. states, the Pfizer and Moderna COVID-19 vaccines were 89% and 96% effective, respectively, at preventing symptomatic COVID-19 infections in fully vaccinated workers, according to final results reported yesterday in the New England Journal of Medicine. The Centers for Disease Control and Prevention reported interim results from the study in May.
 

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