Recently in my A&P class, we've been talking about the human immune system and the different ways the body defends itself. We eventually got around to AIDs and how it mutates one step ahead of the body's third line of defense, leaving the body to try to create antibodies for the new mutation. Just before the body makes antibodies for the mutated virus, it goes around for another and thus begins a vicious cycle of drug cocktails and inevitably, death.
I don't expect any other bloggers to have the right answer, because if you did, you probably shouldn't be blogging and should be out making lots o' money curing AIDs. However, how would you either slow down the mutations or speed up the body's creation of antibodies?
(Without going into a lot of detail, even a LITTLE idea of how the AIDs virus works is a good base for formulating an idea)