Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) Delta Outbreak Among Fully Vaccinated Nursing Home Residents Likely Initiated by a Fully Vaccinated Staff Member - Connecticut, July-August 2021.

During July-August 2021, a coronavirus disease 2019 (COVID-19) outbreak involving 21 residents (all fully vaccinated) and 10 staff (9 fully vaccinated) occurred in a Connecticut nursing home. The outbreak was likely initiated by a fully vaccinated staff member and propagated by fully vaccinated persons. Prior COVID-19 was protective among vaccinated residents.