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. at that place are five identified subtypes of Ebola virus. Four of the five have caused disease in humans: Ebola-Zaire, Ebola-Sudan, Ebola-Ivory Coast and Ebola-Bundibugyo. The fifth, Ebola-Reston, has caused disease in nonhuman primates, but not in humans.
Ebola-Reston virus caused severe sickness and death
in monkeys imported to research facilities in the linked
States and Italy from the Philippines; during these outbreaks,
several research workers became infected with the virus, but
did not capture ill.
No case of the disease in humans has ever been reported in the United States.
Infections with Ebola virus are grave. There is no carrier
state. Because the natural reservoir of the virus is unknown,
the modality in which the virus first appears in a human at the
start of an outbreak has not been determined. However,
researchers have hypothesized that the first patient
becomes infected through contact with an infected animal.
aft(prenominal) the first case-patient in an outbreak setting is infected,
the virus mint be transmitted in several ways. People rear be
exposed to Ebola virus from direct contact with the blood
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