Eli5 why not finishing a full course of antibiotics causes resistant strains of bacteria

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My understanding is that the antibiotics won’t kill the random mutant bacteria anyway, so doesn’t killing off all the susceptible ones just allow for more room for the mutants?

Does it have to do with more base bacteria getting the chance to mutate? A specific resistance has to be pretty rare right? Or will you have multiples of the same mutation in a “colony”?

In: Biology

6 Answers

Anonymous 0 Comments

It’s exactly like they say, “What doesn’t kill you makes you stronger.” Almost but not quite killing the bacteria concentrates the stronger survivors, and then they have more resistant progeny. It pushes their evolution toward superbugs.

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