70 percent of all aids cases are transmitted from sexual intercourse. Sexually transmitted diseases are among the most simple diseases to protect. Change you behavior and you greatly reduce you chance of getting that class of diseases.
In Africa some people do not know this, i realize that. Ignorance is not an excuse to ask for billions to find a cure for a disease that is nearly 100 percent preventable. Once the health infrastructure is fixed in Africa (if you can keep the dirty dictator's hands out of the money jar, that should be possible), the only thing that people will have to do to not get aids, is to not screw around.
In china the panda will not screw to save itself, in Africa they will not stop screwing to save their selves. [rueful shaking of head]
I was driving to work listening to the local am station's morning news. They were giving a phone interview with a guy who apparently knew a lot about aids (actually he was just an activist). When the knowledgeable guy was asked what we could do to help the aids problem, he answered that we should get tested. That is right!?!?!? He answered that we should get tested. He then went on explained we needed to treat the aids test like it was a cholesterol test, and have it added to the normal battery of tests you get when you go the doctor.
I do not know much about viruses, but from reading a recent tech central article i learned the aids virus replicates with a high mutation rate. Which means it can become resistant easily. I do not know how easy it can mutate to use a different mode of transmission, but it if goes airborne, the entire human race is dead in 15 years, except the people who are naturally immune. It so happens aids acts much like the bubonic plague when it is inside the body, so there are a few people out there who have a natural defense to aids.