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Superseded


This Document Has Been Replaced By: Ebola virus disease (EVD) : algorithm for evaluation of the returned traveler
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Up-to-date Information

Up-to-Date Info: To find the latest CDC information on this topic go to: http://www.cdc.gov/vhf/ebola/index.html

Ebola hemorrhagic fever

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    • Corporate Authors:
      National Center for Emerging and Zoonotic Infectious Diseases (U.S.). Division of High-Consequence Pathogens and Pathology.
    • Description:
      Ebola hemorrhagic fever (Ebola HF) is one of numerous Viral Hemorrhagic Fevers. It is a severe, often fatal disease in humans and nonhuman primates (such as monkeys, gorillas, and chimpanzees).

      Ebola HF is caused by infection with a virus of the genus Ebolavirus. When infection occurs, symptoms usually begin abruptly. The first Ebolavirus species was discovered in 1976 in what is now the Democratic Republic of the Congo near the Ebola River. Since then, outbreaks have appeared sporadically.

      There are five identified subspecies of Ebolavirus. Four of the five have caused disease in humans: Ebola virus (Zaire ebolavirus); Sudan virus (Sudan ebolavirus); Taï Forest virus (Taï Forest ebolavirus, formerly Côte d’Ivoire ebolavirus); and Bundibugyo virus (Bundibugyo ebolavirus). The fifth, Reston virus (Reston ebolavirus), has caused disease in nonhuman primates, but not in humans.

      The natural reservoir host of ebolaviruses remains unknown. However, on the basis of available evidence and the nature of similar viruses, researchers believe that the virus is zoonotic (animal-borne) with bats being the most likely reservoir. Four of the five subtypes occur in an animal host native to Africa.

      A host of similar species is probably associated with Reston virus, which was isolated from infected cynomolgous monkeys imported to the United States and Italy from the Philippines. Both in the Philippines and during the outbreaks in US holding facilities, several workers became infected with the virus, but did not become ill.

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