Knowing how and where the infection of humans by HIV began is the source of numerous studies. Now, Jacques Pepin has written a book “The Origins of AIDS” (University Press), where he addresses this problem brilliantly. According to Pepin, the disease is the result of a jump in infection between different species, the transmission to men from chimpanzees which had lived peacefully with the infection for thousands of years in western equatorial Africa. This interspecies jump probably occurred when some hunters were exposed to the infection while they butchered chimpanzees (see more HERE).
Book Review by Cambridge catalog see HERE