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Scientists believe that HIV first emerged in the 1930s from a virus found in chimpanzees in West Africa and was first transmitted to humans through hunting through blood. In recent decades, the virus has spread to Africa and other parts of the world. The hiv.gov timeline traces the history of the national HIV/AIDS epidemic from cases first reported in 1981 to the present, and advances in HIV prevention, management, and treatment offer hope for longer, healthier lives for those living with HIV. disease.
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