Emerg Infect Dis. 2022 Nov;28(11):2338-2341. doi: 10.3201/eid2811.221043. Epub 2022 Sep 28.
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.
2021 年 4 月,美国华盛顿的一家熟练护理机构发生了 SARS-CoV-2 P.1(伽马)变异株疫情。该起疫情中,2 剂 mRNA 疫苗预防 P.1 感染的有效性为 75.0%(95%CI 44.5%-88.7%),与其他长期护理居民中的德尔塔变异株前效性相似。