Three studies on COVID-19 prevention in nursing homes published today in Morbidity and Mortality Weekly Report suggest that regular testing of residents and staff to identify asymptomatic infections may help contain outbreaks and that Centers for Medicare & Medicaid Services (CMS) star ratings could serve as a proxy for coronavirus outbreak risk.Key role for serial testingThe first study, by researchers at the Minnesota Department of Health and the Centers for Disease Control and Prevention (CDC), found that weekly universal COVID-19 testing at two Minnesota skilled nursing facilities (SNFs) from April to June detected infections in 64% of residents and 33% of healthcare providers (HCPs).Genetic sequencing of the viruses showed