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Detection of E. coli O157:H7 in feces of six calves administered probiotic bacteria and administered E. coli O157:H7 2 days later. Bacterial enumeration was performed by surface plating on SMA-NA plates, in duplicate. The arrow indicates that detection of E. coli O157:H7 was by an enrichment procedure in which 9 g of feces was positive for E. coli O157:H7.
