Effectiveness of Pfizer-BioNTech and Moderna Vaccines in Preventing SARS-CoV-2 Infection Among Nursing Home Residents Before and During Widespread Circulation of the SARS-CoV-2 B.1.617.2 (Delta) Variant - National Healthcare Safety Network, March 1-Aug...

COVID-19 mRNA vaccines, Pfizer-BioNTech and Moderna, are effective against infection among nursing home residents, but effectiveness declined in recent months.

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