Another source of antibiotic resistance (which the article forgets to mention) is their routine use in livestock, preventatively and to accelerate growth. I would wager that is the far more significant contributor, since there's simply much more of it - compare the total number of cattle in places where such use is allowed (meaning cattle are exposed to antibiotics for most of their lives), versus the number of people being treated with antibiotics (i.e. a very limited population, for a very limited period):
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