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Haber Kaynağı: Çeşitli Haber Siteleri
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
For frontline workers, COVID-19 mRNA vaccines, Pfizer-BioNTech and Moderna, are effective against viral infection, but less effective during Delta variant spread.
https://tools.cdc.gov/api/embed/downloader/download.asp?m=342778&c=426097
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