Good thing this didn't happen in the U.S.A. Otherwise the families of the robbers would be suing the hospitals for wrongful death.

If my memory of microbiology serves me correctly, the variance in HIV has more to do with the super error-prone reverse transcription process than it does with the virus actually trying to evade destruction. Transcribing DNA from RNA also requires elements of the host cell, which can vary from person to person, and there is no error checking done at all.