english: Basically, the massive use of antibiotics around the world has imposed such large selection pressure on bacteria that resistance is now a problem, because we've now selected for just the resistant bacteria.
non_english: Takéto celosvetové používanie antibiotík viedlo k obrovskému selekčnému tlaku  na bakteriálne populácie a vznikol problém s rezistenciou, pretože teraz nás napádajú  len rezistentné baktérie.