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'''Ebola hemorrhagic fever''' is a severe, often-fatal disease in humans and primates that has appeared sporadically since its initial recognition in 1976.
The disease is caused by infection with [[Ebola virus]], named after a river in the [[Zaire]], where it was first recognized.
The virus is one of two members of a family of [[RNA virus]]es called the [[Filoviridae]]. There are five identified subtypes of Ebola virus. Four of the five have caused disease in humans: Ebola-Zaire, Ebola-Sudan, Ebola-Ivory Coast and Ebola-Bundibugyo. The fifth, Ebola-Reston, has caused disease only in primates.
==Source==
*[http://www.cdc.gov/ncidod/dvrd/Spb/mnpages/dispages/ebola/qa.htm CDC]