I happened to run across this video just recently and it was fascinating and I believe it answers the question of why some people survive AIDS and some do not. It’s connected to a genetic mutation they discovered researching the Black Plague.
The Plague: How Did One Village Survive? | Riddle Of The Plague Survivors | Timeline
https://www.youtube.com/watch?v=WfRJEm96Lgo
Thanks. Watching.