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Christ. There are some idiots in this thread.
The Human Immuno-deficiency Virus is a mutation of the Simian Immuno-defiency Virus, which affects certain other primates.
The outer coating of protein polypeptides frequently changes due to mutation of the virus RNA, therefore making it very difficult to manufacture a permanent vaccine.
The virus does not discriminate against who it infects on grounds of race, colour or sexual orientation - it will infect any human who does not have natural immunity.
The virus is spread primarily by IV drug users sharing needles, blood transfusions of infected blood and practicers of sex without condoms.
The reason the virus at first infected many gay people was that anal sex creates lesions on the anus which allow the virus to enter the blood.
The reason that the virus infected so many black Africans was that their promiscuous sexual practices played right into the virus' hands and that local superstition and poor education kept them from changing those practices.
*** I haven't studied biology for 15 years so there may be a few errors in the above.
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