The long-running Ebola outbreak in northeastern Democratic Republic of the Congo has encountered another setback, with health authorities confirming on Friday that a new case has been discovered after 52 days without a positive diagnosis. The country had been expected to declare the outbreak over on Monday, which would have been 42 days after the last Ebola survivor had been declared free of infection and discharged from an Ebola treatment clinic. Forty-two days is the length of two incubation periods of the disease and is considered the point at which it can be reasonably safe to declare an outbreak over.

 

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