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Preliminary results from an ongoing multisite case-control study of healthcare personnel in 25 states indicate the two mRNA COVID-19 vaccines are 94% effective in real-world conditions involving work and the community, the CDC reported. The study is underway at 33 sites, with 75% of enrolled healthcare workers employed at acute care hospitals.

Moderna, Pfizer Vaccines Showing Strong Protection in Healthcare Personnel

CDC: Employees protected at work, in their communities