Since a virus carried by some apes in Africa is very similar to HIV seen in humans, the most valid opinion about the origin of AIDS is that the disease is of African origin. Scientific predictions are focused on how the virus found in monkeys lives in organisms in the natural environment, mutating, and then passing on to humans.

Another view is that the virus is intended to be produced as a biological weapon, but the result is that research has not been continued because the effect has been seen for a long time, and it has been taken out of the laboratory and infected with humans.

It is also thought that green monkeys may have been infected by monkeys from well-uncooked flesh, such as cuts that may come to the forehead, due to the eaten in most parts of Africa.