Study Dates HIV Ancestor to at Least 32,000 Years Ago
September 28, 2010
New research suggests that the simian immunodeficiency virus (SIV) lineage was already circulating in monkeys and apes at least 32,000 years ago. During the millennia since, humans would have been exposed to it countless times as they butchered monkeys for food. However, only between the 1800s and 1959 did a human infection from a chimpanzee virus spread widely enough to eventually evolve into the present HIV epidemic.
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