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Piglets challenged by enterotoxigenic Escherichia coli were fed either a control diet (A group, n = 10), or control diet plus chlortetracycline (B group, n = 10) or control diet plus chitosan (C group, n = 10) for 21 days. Diarrhea index (%) was calculated as 100× number of piglets that had diarrhea/total number of piglets.
