One of the reasons, and I don’t know how much weight it has, is that a lot of people stop taking antibiotics as soon as their symptoms disappear. In some of those cases, the bacteria remaining will mutate to survive those antibiotics, resulting in more resilient/resistant bacteria. The old whatever doesn’t kill you makes you stronger. But for the bacteria, not us.
Those more resilient bacteria grow and give you another infection, then they get passed to other people, and the old antibiotics don’t work for them or you.
Back in the day antibiotics got prescribed for all kinds of things, even if you didn’t really need them (like allergies). Now medical professionals are more cautious and stress that you have to finish your whole course of them, even if you feel better.
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