AIDS researchers believe that the global epidemic known as HIV/AIDS started as early as

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Most scientists believe that HIV, the virus that causes AIDS, originated in non-human primates in Central and West Africa and transferred to humans in the early 20th century, with the earliest confirmed case traced back to 1959. The consensus points to the 1930s as the period when the virus may have first transferred to humans.

AIDS Researchers Believe That the Global Epidemic Known as HIV/AIDS