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Changes in fecal VT2 levels after administration of bovine colostral antibody or whey in beagle dogs inoculated with Escherichia coli O157:H7. Fosfomycin (50 mg/kg) was administered on the day after inoculation. Vertical arrows indicate the administration of 100 mL bovine colostral antibody or whey. The reciprocals of neutralizing test (NT) titers to VT2 are plotted on the ordinate. *, P < 0.05 (unpaired Student t test) compared with day 3 value.
