Pfizer, Moderna vaccines highly effective after first shot in real-world use - US study
Covid-19 vaccines developed by Pfizer Inc with BioNTech SE and Moderna Inc reduced risk of infection by 80% two weeks or more after the first of two shots, according to data from a real-world US study released on Monday.
The risk of infection fell 90% by two weeks after the second shot, the study of nearly 4,000 US healthcare personnel and first responders found.
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