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Emergent virus
An emergent virus is a virus that has adapted and emerged as a new disease/pathogenic strain, with attributes facilitating pathogenicity in a field not normally associated with that virus. This includes viruses that are the cause of a disease which has notably increased in incidence; this is often a result of a wide variety of causes from both the influence of man and nature. Most emergent viruses can be categorized as zoonotic (an animal disease that can be transmitted to humans), this has the advantage of possibly having several natural reservoirs for the disease.
==Overview==
The most important factor in the development of an emergent disease, to humans, is the ability to pass from animal host to humans. There is little to no occurrence of spontaneous new virus species development, although the possible exception commonly cited is Ebola virus. Most often the virus, due to selection pressure for an animal version of the strain of disease to mutate and therefore adapt to the infection of human hosts.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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