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by notahacker 1471 days ago
Widespread resistance to particular antibiotics is also the product of an advanced industrial society where new variants of pathogens spread easily amongst billions of internationally-travelling city dwellers and widespread prophylactic use of the antibiotic creates strong selection pressures.

Its a bit different after an apocalypse. In theory, an isolated post-apocalyptic community could roll a 1 and get bacteria that is resistant to locally available natural and stockpiled antibiotics in their community, but that's quite low down their list of concerns.