The mystery disease in South Sudan has not been identified but is known to cause fever and unexplained bleeding. Above: an image of another hemorrhagic fever, Marburg virus, made with an electron microscope and then colorized. BSIP/UIG/Getty Images hide caption

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Margaret Chan (left), director general of the World Health Organization, is among the dignitaries visiting a military base in Conakry, Guinea, on a tour of west African countries affected by Ebola. Also pictured: Guinean President Alpha Conde (fourth from right) and U.N. Secretary General Ban Ki-Moon (right). BINANI/AFP/Getty Images hide caption

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WHO Aims To Reform Itself But Health Experts Aren't Yet Impressed

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Scientists Say It's Time To End 'Parachute Research'

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Mamuedeh Kanneh (right) was married to the man who brought Ebola to Barkedu, Liberia, a village of about 6,000. He died of the virus. She now cares for her children as well as children who lost their parents to the disease. John W. Poole/NPR hide caption

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The multimammate mouse can transmit Lassa virus to humans. The virus is likely spread when the rodent urinates or defecates on grain supplies. US National Library of Medicine, National Institutes of Health hide caption

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Garmai Sumo is a nurse featured in the documentary, Body Team 12. In one scene, she shares her religious views: "When they die, the righteous will resurrect on the day of the trumpet. But everyone remain in their grave for now." Body Team 12 hide caption

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A corpse has tested positive for the Ebola virus in Sierra Leone, a day after world health officials declared West Africa free of the disease. On Friday, people pass a banner reading "STOP EBOLA" — part of Sierra Leone's health campaign — in the city of Freetown. Aurelie Marrier d'Unienville/AP hide caption

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