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| [[Image:HIV-budding.jpg|right|thumbnail|300px|[[Scanning electron microscope|Scanning electron micrograph]] of HIV-1 budding from cultured [[lymphocyte]].]] | | #REDIRECT [[AIDS historical perspective]] |
| {{AIDS}}
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| {{CMG}}
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| ==Overview==
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| [[HIV]], the infectious agent of [[Acquired Immunodeficiency Syndrome|AIDS]], is thought to have originated in non-human [[primate]]s in sub-Saharan Africa and transferred to humans during the 20th century. The epidemic officially began on 5 June 1981.
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| Two species of HIV infect humans: HIV-1 and HIV-2. HIV-2 may have originated from the [[Sooty Mangabey]] (''Cercocebus atys''), an Old World monkey of [[Guinea-Bissau]], [[Gabon]], and [[Cameroon]].<ref name=Reeves>{{cite journal
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| | author=Reeves, J. D. and Doms, R. W
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| | title=Human Immunodeficiency Virus Type 2
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| | journal=J. Gen. Virol. | year=2002 | pages=1253-1265 | volume=83 | issue=Pt 6
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| | id= PMID 12029140
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| }}</ref> HIV-1 is more virulent. It is easily transmitted and is the cause of the majority of HIV infections globally. HIV-2 is less transmittable and is largely confined to [[West Africa]]. HIV-1 is the species described below.
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| ==Reference==
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| {{reflist|2}}
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| [[Category:AIDS origin hypotheses]]
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| [[fr:Origine du sida]]
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