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Longitudinal study of the prevalence of E. coli ONT:H25 and E. coli O157:H7 in dairy heifers. RAMS samples from 40 heifers were cultured for E. coli ONT:H25 and E. coli O157:H7. Prevalence of ONT:H25 was significantly higher than for O157:H7 in the months of October and March (P < 0.05, McNemar's chi-square). No samples were obtained in September. Bars represent 95% confidence intervals.
