Debate continues on timing of monkey->chimp->human transmission of SIV/HIV...
Scientists have argued about the origin of the AIDS epidemic since it surfaced in 1981, but this much is widely accepted today: Sometime around 1931, HIV-1, the main virus driving the epidemic, likely entered humans from chimpanzees, which are infected with a related virus called SIVcpz. The chimp virus, in turn, is a blend of SIVs from two different monkey species.
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