Ebola virus disease (EVD) in  West Africa: an extraordinary  epidemic.
D000354:Africa, Western / Q000453:epidemiology; D057210:Delayed Diagnosis / Q000401:mortality; D016701:Guinea / Q000453:epidemiology; D006268:Health Facilities / Q000592:standards; D006282:Health Personnel / Q000706:statistics & numerical data; D019142:Hemorrhagic Fever, Ebola / Q000175:diagnosis / Q000453:epidemiology* / Q000401:mortality; D006801:Humans; D007988:Liberia / Q000453:epidemiology; D058873:Pandemics / Q000706:statistics & numerical data*; D012807:Sierra Leone / Q000453:epidemiology; D013997:Time Factors