FILE - In this Tuesday, Sept. 30, 2014 file photo, Nowa Paye, 9, is taken to an ambulance after showing signs of Ebola infection in the village of Freeman Reserve, about 30 miles north of Monrovia, in Liberia. (AP Photo/Jerome Delay, File)
GENEVA – By early June of last year, the Ebola epidemic centered on Guinea was the deadliest ever recorded. Foreign workers were being evacuated. Top disease-fighters warned that the virus could soon spread across West Africa.