Well if they survive the treatment, does it not increase the odds of the bacterium mutating?
So many articles on the news about physicians over-prescribing antibiotics and/or people (in this example) not taking the full course of treatment, because their symptoms improve, and now there are "super-bugs" that have become drug resistant. It was my impression that this was cause/effect. One would think the same sort of thing would happen in other creatures concerning bacterial infections and treatment with antibiotics. That's why Tetracycline is hardly ever used in freshwater anymore, because over time it became ineffective against the bacterial infections it was used to treat.
Jenn