On Apr. 4, 2023, NIH-funded research was announced from the University of Rochester and Harvard University that looked at data collected collected by more than 13,000 skilled nursing facilities during the pandemic.

During the entire period studied, facilities that did the most testing (top 10%) had about 43 deaths per 100 outbreaks, compared to about 50 deaths per 100 outbreaks in facilities that did the least testing (bottom 10%). Facilities that did the most testing detected about 15% more COVID-19 infections among staff than those that did the least. This suggests that frequent testing captured more asymptomatic staff infections that could seed outbreaks.