[shabble]

> * We saw the emergence of penicillin resistence in S. Aureas, then methicillin resistance. we moved to quinalones, and sulfa and we see resisance develop there.. OF COURSE it does. The antibiotics don't cause resistance.. Natural selection is the process going on here.*

[...]

> When I hear people claim it was wanton use of antibiotics that caused all of this.. I wonder if they ever read a word about biologic evolution

Natural selection describes the shift in characteristics of a population due to some environmental pressure which favours individuals with specific characteristics. How they acquire those characteristics is largely immaterial, be it through random mutation, sexual reproduction, viral transduction, etc.

So yes, natural selection is the process by which the resistant bacteria outcompete the vulnerable ones, and thus become the dominant population. But the reason that occurs in the first place is because of the environmental pressure induced by the antibiotic.

Or am I missing something here?