Transmission electron micrograph (TEM) revealed some of the ultrastructural morphology displayed by an Ebola virus virion. Ebola haemorrhagic fever (Ebola HF) is a severe,often-fatal disease in humans and nonhuman primates (monkeys,gorillas,and chimpanzees) 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 Democratic Republic of the Congo (formerly Zaire) in Africa,where it was first recognized. The virus is one of two members of a family of RNA viruses called the Filoviridae. There are four identified subtypes of Ebola virus. Three of the four have caused disease in humans: Ebola-Zaire,Ebola-Sudan,and Ebola-Ivory Coast. The fourth,Ebola-Reston,has caused disease in nonhuman primates,but not in humans |