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Journal of Bacteriology, December 2003, p. 7024-7028, Vol. 185, No. 23
0021-9193/03/$08.00+0     DOI: 10.1128/JB.185.23.7024-7028.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

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

Haruyoshi Tomita,1 Koichi Tanimoto,2 Satoshi Hayakawa,3 Kyoko Morinaga,1 Kohji Ezaki,3 Hisaji Oshima,3 and Yasuyoshi Ike1,2*

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{alpha} (65.9 kbp), pHTß (63.7 kbp), and pHT{gamma} (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 (Gmr; 65.1 kb).

* Corresponding author. Mailing address: Department of Bacteriology and Bacterial Infection Control, Gunma University Graduate School of Medicine, Showa-machi 3-39-22, Maebashi, Gunma 371-8511, Japan. Phone: 81-27-220-7990. Fax: 81-27-220-7996. E-mail: yasuike{at}med.gunma-u.ac.jp.

Journal of Bacteriology, December 2003, p. 7024-7028, Vol. 185, No. 23
0021-9193/03/$08.00+0     DOI: 10.1128/JB.185.23.7024-7028.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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