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Antimicrobial Resistance In Enterococci Isolated From Turkey Flocks Fed Virginiamycin

L. A. Welton, L. A. Thal, M. B. Perri, S. Donabedian, J. McMahon, J. W. Chow, M. J. Zervos

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ABSTRACT From 125 separate cloacal cultures from three turkey flocks fed virginiamycin, 104 Enterococcus faecium and 186 Enterococcus faecalis isolates were obtained. As the turkeys aged, there was a higher percentage of quinupristin-dalfopristin-resistant E. faecium isolates, with isolates from the oldest flock being 100% resistant. There were no vancomycin-resistant enterococci. Results of pulsed-field gel electrophoresis (PFGE) indicated there were 11 PFGE types of E. faecalis and 7 PFGE types of E. faecium that were in more than one group of flock cultures.