A french documentary that explores and identifies the origin of AIDS in Africa at the end of the 50's. Some scientists have used kidneys of chimpanzees infected by the simian AIDS to develop a vaccine against poliomyelitis. These scientists have keep secret the use of chimpanzees because the rest of the community were knowing the risks of transmission of various unsuspected diseases from this race of apes so close to the human race. The simian AIDS has been involuntary inoculated to young Africans when vaccinated against polio and has muted to become human AIDS. The virus has then begun to spread from these foyers where people have been vaccinated.