Ebola virus

Ebola virus , a member of a family (Filovirus) of viruses that cause hemorrhagic fevers. The virus, named for the region in Congo (Kinshasa) where it was first identified in 1976, emerged from the rain forest, where it survives in as yet unconfirmed hosts, possibly several species of fruit bats. The virus can be fatal to chimpanzees and gorillas as well as humans.

Several strains of the virus found in Africa cause hemorrhagic fever; one found in the W Pacific does not. Once a person is infected with the virus, the disease has an incubation period of 2-21 days; however, some infected persons are asymptomatic. Initial symptoms are sudden malaise, headache, and muscle pain, progressing to high fever, vomiting, severe hemorrhaging (internally and out of the eyes and mouth) and in 50%-90% of patients, death, usually within days. The likelihood of death is governed by the virulence of the particular Ebola strain involved. Ebola virus is transmitted in body fluids and secretions; there is no evidence of transmission by casual contact. There is no vaccine and no cure.

Outbreaks of Ebola virus in humans occurred in both Congo-Kinshasa (then Zaïre) and Sudan in 1976 and 1979; other outbreaks have occurred since in Gabon, Uganda, and both Congos. Outbreaks have been exacerbated by underequipped hospitals that reused syringes and lacked proper protective clothing for personnel. In 1989 a similar virus was found in monkeys imported to the United States.

Ebola virus (i-boh-lă) n. a virus responsible for an acute infection in humans with features similar to those of Marburg disease. Transmission is by contact with infected blood and other body fluids. The mortality rate is 53–88%, but intensive treatment (including rehydration) in the early stages of the disease can halt its rapid and usually irreversible progression to haemorrhaging of internal organs.

ebola Virus that causes haemorrhagic fever. Thought to have been long present in animals, the ebola virus was first identified in humans during an outbreak in Congo in 1976. It is acquired through contact with contaminated body fluids. Death rates can be as high as 90%.