More than half of residents of a Seattle-area nursing home had no symptoms when they tested positive for COVID-19 and had probably already spread the disease, according to a study published late last week in the New England Journal of Medicine (NEJM). Also, a study in Emerging Infectious Diseases (EID) found that all five household contacts of a mildly symptomatic doctor in Wuhan, China infected with the novel coronavirus had the disease but no symptoms.

 

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