Sporadic Outbreaks of Healthcare-Associated COVID-19 Infection in a Highly-Vaccinated Inpatient Population During a Community Outbreak of the B.1.617.2 Variant: the Role of Enhanced Infection-Prevention Measures.

Sporadic clusters of health care-associated COVID-19 infection occurred in a highly vaccinated health care-workers and patient population, over a 3-month period during ongoing community transmission of the B.1.617.2 variant. Enhanced infection-prevention measures and robust surveillance systems, including routine-rostered-testing of all inpatients and staff and usage of N95-respirators in all clinical areas, were insufficient in achieving zero health care-associated transmission. The unvaccinated and immunocompromised remain at-risk and should be prioritized for enhanced surveillance.