More than half the residents who tested positive were asymptomatic at testing. Nursing homes are now recognized as niduses of infection with SARS-CoV-2. On February 29,2020, because of known COVID-19 in their area, a nursing home in King County, Washington, instituted enhanced infection control measures and soon identified a resident and staff member who were infected. This prompted a larger study culminating in two point-prevalence surveys of the residents. Fulltime staff were also tested.
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