Proportion of Deaths and Clinical Features in

The ¿ rst known Ebola hemorrhagic fever (EHF) out-break caused by Bundibugyo Ebola virus occurred in Bundibugyo District, Uganda, in 2007. Fifty-six cases of EHF were laboratory con ¿ rmed. Although signs and symp-toms were largely nonspeci ¿ c and similar to those of EHF outbreaks caused by Zaire and Sudan Ebola viruses, pro-portion of deaths among those infected was lower (|40%). Ebola hemorrhagic fever (EHF) is a severe disease caused by several species of Ebolavirus (EBOV), in the family Filoviridae. Before 2007, four species of EBOV had been identi ¿ ed; 2 of these, Zaire ebolavirus and Sudan ebolavirus, have caused large human outbreaks in Africa, with proportion of deaths |80%–90 % and 50%, respectively (1–5). Large outbreaks are associated with person-to-person transmission after the virus is introduced into humans from a zoonotic reservoir. Data suggest tha