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Distribution of resistance genes to tetracycline (A), erythromycin (B), and both tetracycline and erythromycin (C)-resistant Enterococcus faecalis isolated from 9 broiler breeder farms. The tetL gene for tetracycline resistance (A) and ermA and mef genes for erythromycin resistance (B) were not detected in any of the isolates. The distribution of antimicrobial resistance genes showed a significant difference among 9 broiler breeder farms (P < 0.05).
