I've spent a few summers taking water samples from public beaches. Our lakes are supposed to have excellent water and we still have minor probelms with things like enterobacteria every now and then. So I can only imagine just how "minor" the probelm can be in some places. And I don't know what the situation is in the rest of the world, but at least here we have to monitor the water quality because the law says so.
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A pig, in a cage, on antibiotics.
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