Beatrice Hahn of the University of Alabama-Birmingham, who has conducted much of the research into HIV's origin. HIV-2, on the other hand, is not as virulent and largely confined to West Africa, where it originated. In May 2006, an international group of researchers led by Hahn answered two major questions about the origin of HIV-1 M, the deadliest and most widespread form of the virus: Where was its cradle, and what kind of chimp did it come from? Answering the questions was literally messy work -- researchers collected 599 waste samples from wild chimpanzees and analyzed the viral particles they contained -- but the results were immaculate...
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Three populations of Pan troglodytes troglodytes living in southern Cameroon provided the crucial data. Two of those populations currently carry SIVs that are molecular dead ringers for HIV-1 M, while many chimps in the third group are infected with an SIV remarkably similar to HIV-1 N. Group O's simian sibling is probably lurking in other chimp populations in West Central Africa, says Hahn, adding that she has "a pretty good idea where it's going to be … and we're going to find it...
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