Of course it has.
Thousands of times.
Africa's "AIDS" is not!
Instead, to increase their ability to beg and to line up at the international public trough [Read: At the squandering of the confiscated wealth of America's (IE: Of the world's) most creative, innovative and productive!] Afica's gummints and the European-based criminal organizations [AKA "NGOs"] that assist their larceny, have changed the diagnosis of "AIDS" to EXCLUDE the HI virus -- and to include every African illness -- many of them caused by Africa's obscene politics -- known to medical science! And lots that are not so known!
Brian's point about loosening the definition of aids is also correct. In most instances, the person who contracts aids already has a decreased immune system because of other diseases. In the US, homosexual males frequently eat each other's feces, and "gay bowel syndrome" was well-known throughout San Francisco prior to the aids outbreak. In Africa, frequently people bathe, urinate, crap, and drink within yards of each other in lakes and rivers. In almost all cases of "heterosexual" aids, you'll find other factors, such as drug abuse, hemophilia, bisexuality, or other "dirty" sexual techniques (those which transmit feces, etc, from one person to another.)