| In a study of 3,950 health-care personnel, police, firefighters and other essential workers, the Pfizer-BioNTech and Moderna shots reduced the risk of infection by 80 percent after one shot, the study from the Centers for Disease Control and Prevention found. Following the second dose, protection increased to 90 percent, a finding that provides strong reassurance of protection for front-line workers in the United States. | 
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