"The link that xcheopis found showing that two separate strains of HIV were found simultaneously has some interesting results. The scientists could not get both strains to infect the same cell and hypothesized that each strain is infecting only certain cells."
To me, this suggests that there is an environmental factor, if it is not caused by the virus infecting specific cells as suggested - if A happens, then HIV infects the cells, else it lies dormant. Perhaps that would explain the supposed drug connection - the drugs catalyze A allowing HIV to infect the cells, causing some people to think that the drugs were the cause not HIV. And, of course, our own immune system could be A as you suggested too.
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