Origins

The first case of AIDS was reported in June 5, 1981, when the U.S. Centers for Disease Control and Prevention had recorded a cluster of PCP (Pneumocystis carinii pneumonia). Although it was reported in 5 homosexual men in Los Angeles, it is though that it originated in Africa. It was already proven that AIDS also originated from primates.

Theories of how AIDS was transmitted from primate to human vary. One theory is that direct contact like hunting or butchery spread the HIV through a primate's blood making contact with an open wound in a human, or through digestion of the blood through eating monkeys.

Another theory is more controversial, known as the Oral Polio Vaccine (OPV) AIDS hypothesis. It suggests that during testing of an oral vaccine for polio, the vaccines were prepared from chimpanzee tissue cultures, some of which might have had SIV (Simian Immunodeficiency Virus), and the volunteers were the first to experience HIV-1 infections and AIDS 5 years later. Another speculated theory is that AIDS entered the human body due to Dr. Serge Voronoff's grafting of monkey testicle tissues into the testicles of men to attemp to retard aging.