I have done some reading on this subject and it piqued my curiosity. But the question is kind of like "What happens when you die?" ... How can you really know for sure and by the time you do it's a little late.
I do find it odd however that the drug AZT was first tested as a cancer drug and then shelved because it was so toxic that it killed everything they tried to test it on and that when AIDS was discovered the drug was taken off the shelf and prescribed with no further testing.
Makes you really wonder if HIV kills people or the drugs they prescribe for it kill people.