Effectiveness of COVID-19 Vaccines in Preventing SARS-CoV-2 Infection Among Frontline Workers Before and During B.1.617.2 (Delta) Variant Predominance - Eight U.S. Locations, December 2020-August 2021
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For frontline workers, COVID-19 mRNA vaccines, Pfizer-BioNTech and Moderna, are effective against viral infection, but less effective during Delta variant spread.