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Highly Conjugative pMG1-Like Plasmids Carrying Tn1546-Like Transposons That Encode Vancomycin Resistance in Enterococcus faecium

Department of Bacteriology and Bacterial Infection Control,¹ Laboratory of Bacterial Drug Resistance, Gunma University Graduate School of Medicine, Maebashi, Gunma 371-8511,² Department of Clinical Laboratory, Fujita Health University School of Medicine, Toyoake, Aichi 470-1192, Japan³

Received 28 April 2003/ Accepted 29 August 2003

A total of 12 VanA-type vancomycin-resistant enterococci, consisting of 10 Enterococcus faecium isolates and two Enterococcus avium isolates, were examined in detail. The vancomycin resistance conjugative plasmids pHT (65.9 kbp), pHTß (63.7 kbp), and pHT (66.5 kbp) were isolated from each of three different E. faecium strains. The plasmids transferred highly efficiently between enterococcus strains during broth mating and were homologous with pMG1 (Gm^r; 65.1 kb).

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