Ebola hemorrhagic fever (Ebola) is a very contagious illness that is often fatal in humans and nonhuman primates (monkeys, gorillas, and chimpanzees). Ebola has appeared sporadically since it was first recognized in 1976.
Ebola virus is one of two members of a family of RNA viruses called Filoviridae. There are four identified subtypes of Ebola virus. Three of the four have caused disease in humans:
- Ebola-Zaire
- Ebola-Sudan
- Ebola-Ivory Coast.
The fourth Ebola virus subtype, Ebola-Reston, has caused disease in nonhuman primates, but not in humans.
Ebola outbreaks typically appear sporadically. Confirmed cases of Ebola virus infections have been reported in:
- The Democratic Republic of the Congo
- The Ivory Coast
- Gabon
- Sudan
- Uganda.