No other ebola-specific viral proteins have been identified in infected cells. Virion lipids reflect the composition of lipids in the host-cell membranes. Ebola was named for a small river near Maridi, Sudan. Ebola is classified as a biosafety level 4 agent because of its extreme pathogenicity and the lack of a vaccine or antiviral drug. The most highly virulent subtype of Ebola.
Infection usually results in death.
First appeared in 1972, but was not identified until later cases appeared in 1976. An extremely pathogenic subtype. First appeared in 1976 concurrent with the 1976 epidemic of Ebola Zaire. The disease continued to spread within the quarrantine facility even after euthenasia of the monkeys, partly as a result of new shipments of infected animals. The strain has not yet caused disease in humans, although it has infected at least four people.