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buy ceftin 500mg The distinction is important, health researchers say, because drugs given at low doses for growth promotion or disease prevention ??? known as "subtherapeutic" use ??? could lead to drug-resistant bacteria that might make humans sick. And given that these bacteria are proliferating in all kinds of different settings, including hospitals, doctors are worried that antibiotic use on the farm is part of the reason why some of their antibiotics don't work on humans anymore.