A SARS-CoV-2 P.1 (Gamma) variant outbreak occurred at a skilled nursing facility in Washington, USA, in April 2021. Effectiveness of 2 doses of mRNA vaccines against P.1 infection among residents in this outbreak was 75.0% (95% CI 44.5%-88.7%), similar to effectiveness for other pre-Delta variants among long-term care residents.
Keywords: COVID-19; P.1; SARS-CoV-2; United States; coronavirus disease; long-term care; respiratory infections; severe acute respiratory syndrome coronavirus 2; vaccine effectiveness; viruses; zoonoses.