“The ‘oral polio vaccine’ or ‘OPV’ theory has it that AIDS began after an experimental OPV that had been cultured in chimpanzee cells was given to nearly a million Africans from the Congo (DRC), Burundi and Rwanda in the latter half of the 1950s. This hypothesis is highly controverisal, and is rejected by many medical scientists, (including those who prepared and administered the vaccine). There is concerted opposition to the theory from those who publish and write in Nature and Science, the world's two leading scientific journals. However, despite the fact that many of the aforesaid scientists deny it this is the theory that is supported by most of the available historical and scientific evidence.
-- Edward Hooper