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Both HIV-1 and HIV-2 are believed to have originated in primates in West-central Africa and to have transferred to humans (a process known as zoonosis) in the early 20th century. This was probably through eating bush meat.
Genetic studies of the virus suggest it dates back to circa 1910. The earliest well documented case of HIV in a human dates back to 1959 in the Congo.

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10y ago

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