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HIV is believed to have begun in isolated parts of central Africa where the retrovirus made the jump from chimpanzees to humans. Evidence of this was found when retroviruses in AIDS patients appeared more similar to those found in the chimpanzees than to other human retroviruses. It is likely that the retrovirus infected people who ingested chimpanzee meat and it subsequently underwent mutations to form the human retrovirus. Scientists have confirmed that the virus made the jump from chimpanzees to humans around the 1940s or 1950s. However, the virus was slow to spread because members of these rural communities had limited contact with people from other areas...
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