Today, the World Health Organization declares that Ebola virus transmission has been stopped in Sierra Leone. Forty-two days, that is two Ebola virus incubation cycles, have now passed since the last person confirmed to have Ebola virus disease had a second negative blood test.
From: http://www.who.int/entity/mediacentre/news/releases/2015/sierra-leone-stops-ebola/en/index.html
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