Simian AIDS: an historical perspective.

The author has had the unique opportunity to participate, over the last 35 years, in the retrovirus research field that proceeded and followed the discovery of human, simian and feline AIDS. The onset of human AIDS was certainly unanticipated, but in retrospect, the warning signs had been present for at least a decade in captive macaques. I will briefly summarize the key scientific knowledge and 'mindset' leading up to these events and will outline the major contributions and unanswered questions arising from the simian model of AIDS.