Health workers teach people about the Ebola virus and how to prevent infection, in Conakry, Guinea, Monday, March 31, 2014. Health authorities in Guinea are facing an "unprecedented epidemic" of Ebola, the international aid group Doctors Without Borders warned Monday as the death toll from the disease that causes severe bleeding reached 78. The outbreak of Ebola in Guinea poses challenges never seen in previous outbreaks that involved "more remote locations as opposed to urban areas," said Doctors Without Borders. (AP Photo/ Youssouf Bah)