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Prevalence of the bla (CMY-2, TEM, and SHV) genes in 84 tetracycline-ceftiofur-resistant E. coli isolates (14, 12, 14, 19, 13, and 12 for treatment control, bambermycin, penicillin, salinomycin, bacitracin, and salinomycin plus bacitracin, respectively). Detection of the blaCMY-2 gene was performed by PCR as previously described (17).
