The outbreak in DR Congo’s eastern Ituri province has seen around 246 suspected cases and 80 deaths reported, does not meet the criteria of a pandemic emergency.
But it warned it could potentially be “a much larger outbreak” than what is currently being detected and reported, with significant risk of local and regional spread.
The current strain of Ebola is caused by the Bundibugyo virus, the health agency said, for which there are no approved drugs or vaccines.
Early symptoms include fever, muscle pain, fatigue, headache and sore throat, and are followed by vomiting, diarrhoea, a rash and bleeding.
The WHO said there are now eight laboratory-confirmed cases of the virus, with other suspected cases and deaths across three health zones including Bunia the capital of Ituri province, and the gold-mining towns of Mongwalu and Rwampara.
One case of the virus has been confirmed in the capital Kinshasa, believed to be in a patient returning from Ituri. The WHO said that the virus has spread beyond DR Congo, with two confirmed cases reported in neighbouring Uganda. Ugandan officials said a 59-year-old man who died on Thursday had tested positive.
Reeta Chakrabarti presents BBC News at Ten reporting by Joe Inwood and James Gallagher.
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