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:''This article contains hypotheses not currently accepted by the majority of the scientific community. For the majority view within the scientific community, see History of HIV/AIDS.'' Various fringe theories have arisen to speculate about purported alternative origins for the human immunodeficiency virus (HIV) and the acquired immunodeficiency syndrome (AIDS), with claims ranging from it being due to accidental exposure to supposedly purposeful acts. Several inquiries and investigations have been carried out as a result and each of these theories consequently determined to be based on unfounded and/or false information. HIV has been shown to have evolved from or is closely related to the simian immunodeficiency virus (SIV) in West Central Africa sometime in the early 20th century. HIV was not discovered until the 1980s by a French scientist. Before the 1980s, HIV was an unknown deadly disease. ==Discredited Theories== :In 1987 there was some consideration given to the possibility that the "Aids epidemic may have been triggered by the mass vaccination campaign which eradicated smallpox". An article〔 〕 in ''The Times'' suggested this, quoting an unnamed "adviser to WHO" with "''I believe the smallpox vaccine theory is the explanation to the explosion of Aids''". It is now thought that the smallpox vaccine causes serious complications for people who already have impaired immune systems, and the ''Times'' article described the case of a military recruit with "dormant HIV" who died within months of receiving it. But no citation was provided regarding people who did not previously have HIV. Currently HIV is considered to be a contraindication for the smallpox vaccine—both for an infected person and their sexual partners and household members.〔 〕〔 〕 Some conspiracy theorists propose an expanded hypothesis in which the smallpox vaccine was deliberately contaminated with HIV.〔 〕 :In contrast, a research article was published in 2010 suggesting that it might have been the actual eradication of smallpox and the subsequent ''ending'' of the mass vaccination campaign contributed to the sudden emergence of HIV. The theory was the possibility that immunization against smallpox "might play a role in providing an individual with some degree of protection to subsequent HIV infection and/or disease progression."〔 〕 Regardless of the effects of the smallpox vaccine itself, its use in practice in Africa is one of the categories of un-sterile injections that may have contributed to the spread and mutation of the immunodeficiency viruses. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Discredited HIV/AIDS origins theories」の詳細全文を読む スポンサード リンク
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