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Bushmeat practice as the most plausible cause

According to the natural transfer theory (also called 'Hunter Theory' or 'Bushmeat Theory'), the "simplest and most plausible explanation for the cross-species transmission"[7] of SIV or HIV (post mutation), the virus was transmitted from an ape or monkey to a human when a hunter or bushmeat vendor/handler was bitten or cut while hunting or butchering the animal. The resulting exposure to blood or other bodily fluids of the animal can result in SIV infection.[21] A recent serological survey showed that human infections by SIV are not rare in Central Africa: the percentage of people showing seroreactivity to antigens – evidence of current or past SIV infection – was 2.3% among the general population of Cameroon, 7.8% in villages where bushmeat is practiced, and 17.1% in the most exposed people of these villages.[22] How the SIV virus would have transformed into HIV after infection of the hunter or bushmeat handler from the ape/monkey is still a matter of debate, although natural selection would favor any viruses capable of adjusting so that they could infect and reproduce in the T cells of a human host.

Одна из теорий.

Зародилось оно у африканского народа, и существуют несколько видов мутации данного вируса.

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Мутил не мутил ) могла просто укусить и все, по этому много наркоманов попало под этот вирус - кололись одним и тем-же шприцем.