There are also several other deaths suspected to be from Ebola that have not been confirmed by tests.
The death announced today in Sierra Leone is the country's first official confirmed case, though it had been on high alert ever since the disease appeared in Guinea.
Guinea today said that at least one new death emerged in Telimele, 270 kilometers from the region where the outbreak first occurred. Guinea also has eight new suspected Ebola deaths.
Guinea has had most of the 170 deaths from Ebola in the current outbreak in West Africa. There have been a few deaths in Liberia and now at least one in Sierra Leone.
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The case in Sierra Leone was announced today on radio by the Director of Disease Prevention and Control, Dr. Amara Jambai. He said the confirmed Ebola death was near Sierra Leone's border with Guinea.
The new cases are a setback to the efforts to control the Ebola outbreak.
There is no cure and no vaccine for Ebola, which causes a high fever and severe bleeding. The current outbreak is unusual for West Africa as the disease is typically found in the center and east of the continent.
Ebola can incubate for up to 21 days before an infected person shows any symptoms. Doctors like to wait 42 days two incubation periods after the last known infection before declaring an outbreak over.