If you want to know what actually causes AIDS, take the time to read and understand the following:
http://www.duesberg.com/papers/chemical-bases.html
Q: What causes AIDS?
A: Gaps in Foreign Relations.
The better question is how do you force relationships between countries previously unencountered and get the taxpayers to pay for it?
Secondary question is how do you maintain growth in scientific achievement to add to a technologically superior edge against other countries?
AIDS medicine is a huge asset in international relations for those nations that develop and produce it.
bump for later reading.