Pfizer, Moderna Vaccines 94% Effective At Preventing Symptomatic COVID-19, CDC Study Finds

The New York Times (5/14, Anthes) reported, “The Pfizer-BioNTech and Moderna coronavirus vaccines are 94 percent effective at preventing symptomatic Covid-19 illness, according to a new study of more than 1,800 health care workers in the United States.” R...