Chris writes:
> So the use of antibiotics doesn't create resistance but encourages resistance to multiply.

I believe the thinking on this has changed.

> Antimicrobial resistance can be either a natural or an acquired trait; in the former, the microbe is inherently resistant to a class of antibiotic on account of its genetic structure, such as devoid of the specific target of or transporting system for that type of antibiotic; in the latter, the microbe becomes resistant to an antibiotic to which it had been susceptible. Acquired resistance can occur either as a result of mutation in the genomic DNA of the microbe or, more frequently, through genetic exchanges between strains in which DNA elements, such as plasmids, transposons, integrons, and viruses, that carry resistance determinants are transmitted. The existence of interchange of antimicrobial resistance elements among bacteria of human, animal, and environmental origins have been well documented  ...

"Genetic mechanisms of multi-antimicrobial resistance in a pathogenic Edwardsiella tarda strain"

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