bacteria are not viruses, they only carry them. it is only viruses that can mutate. There has been no specific proof of a gene that can avoid aids, if it were, then it'd be on the news and i'd know it by now, because i take a integrated medical science class, and finding that gene will be very hard. The human Genome project would've found it by now, but as i've said its hard to find that particular gene. Also, thats possible by genetic altering, or in simpler terms, mutation. the only mutations i've seen were physical and neurological mutations. Also, cloning humans to make them superhumans is illegal, so therefore, not possible.