What is already known about this topic?
Residents of long-term care facilities (LTCFs) are at risk for severe COVID-19. Facility-wide testing, even in the absence of a reported COVID-19 case, can identify asymptomatic and presymptomatic infection in LTCFs.
What is added by this report?
LTCFs in which testing was conducted after a confirmed case of COVID-19 were found to have significantly higher proportions of infected residents and staff members at initial testing and after 4 weeks of follow-up compared with those testing as a preventive measure. The majority of LTCFs testing as a preventive measure identified an infection, although initial prevalence was significantly lower and fewer cases occurred during follow-up.
What are the implications for public health practice?
Proactive testing of LTCF residents and staff members might prevent large COVID-19 outbreaks in LTCFs through early identification and timely infection prevention and control response.