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Conarky, Guinea • Samples from victims of a viral hemorrhagic fever that has killed more than 50 people in Guinea have tested positive for the Ebola virus, government officials said Sunday, marking the first time an outbreak among humans has been detected in this West African nation.

Government spokesman Damantang Albert Camara said the virus was found in tests conducted at a laboratory in Lyon, France.

A Health Ministry statement on Saturday said 80 cases including 59 deaths had been reported, most of them in three southern prefectures near Sierra Leone and Liberia. Three cases, including two deaths, were reported in Conakry, the capital, according to the statement.

A team including the health minister had been dispatched to the region, Camara said, and Doctors Without Borders had set up an isolation unit in Gueckedou to try to stop the disease from spreading.

"In Guinea, a country with a weak medical infrastructure, an outbreak like this can be devastating," Dr. Mohamed Ag Ayoya, country representative for UNICEF, said in a statement Sunday.

Previous Ebola outbreaks have been reported in Congo and Uganda, most recently in 2012. The only prior case of a human contracting the virus in West Africa came in 1994, when a scientist fell ill while responding to Ebola cases among chimpanzees.