A recent study by US researchers in the journal “Water, Air & Soil Pollution” finds that the water downstream from concentrated animal feeding operations (CAFOs) and factory farms has a multi-antibiotic resistance of 41.6%, which is three times higher than streams not impacted by the farms.
http://www.treehugger.com/files/2010/12/cafos-boost-multi-drug-resistant-bacteria-emu-farms.php http://www.americanindependent.com/160298/factory-farming-is-on-the-rise-in-michigan