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Infection with the Ebola virus leads to Ebola hemorrhagic fever (EHF; commonly referred to as simply Ebola) is a recently identified, severe, often fatal infectious disease occurring in humans and some primates.

Ebola was first discovered in 1976, and since its discovery, different strands of Ebola have caused epidemics with 50 to 90 percent mortality in Za?e, Gabon and Uganda.

Among humans, the virus is transmitted by direct contact with infected body fluids such as blood. The incubation period of Ebola hemorrhagic fever varies from two days to four weeks. There are four known strains of Ebola-like viruses, three of which cause the deadly disease, the CDC said on its web site.

The Ebola virus is spread by contact with body fluids, including sweat and saliva. Outbreaks of the disease are rare, and no one knows where the virus lives when it is not infecting humans. The disease usually kills its victims so fast that it also destroys the host for the virus. The viruses are probably preserved in an undefined reservoir in the rain forests of Africa

Symptoms are variable too, but the onset is usually sudden and characterized by high fever, prostration, myalgia, arthralgia, abdominal pains and headache. These symptoms progress to vomiting, diarrhea, oropharyngeal lesions, conjunctivitis, organ damage (notably the kidney and liver) by co-localized necrosis, proteinuria, and bleeding both internal and external, commonly through the gastrointestinal tract. Death or recovery to convalescence occurs within six to ten days.

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