I am aware of this it's been around for awhile basically it came about when we discovered in australia a "subgroup" of HIV with a specific mutation that has a particular protien "Nef" deleted, Indivduals with that mutation while HIV+ Never went onto develop AIDS because your HIV+ Your highly resistant if not immune from begin infected by other strains of HIV.
The problem is it's extremely dangerous. Even I'm edgy of such a deadly virus.
Animal studies are dubious not least because HIV behaves very differently in simians than it dose in humans.