Journal of Antimicrobial Chemotherapy (2002) 49, 837-840
© 2002 The British Society for Antimicrobial Chemotherapy
Molecular characterization of metallo-b-lactamase-producing Acinetobacter baumannii and Acinetobacter genomospecies 3 from Korea: identification of two new integrons carrying the blaVIM-2 gene cassettes
1Department of Clinical Pathology, Research Institute of Bacterial Resistance, and Brain Korea 21 Project for Medical Sciences, Yonsei University College of Medicine, C.P.O. Box 8044, Seoul, Korea; 2Dipartimento di Biologia Molecolare, Sezione di Microbiologia, Università di Siena, I-53100 Siena, Italy
Received 7 September 2001; returned 9 November 2001; revised 11 December 2001; accepted 28 February 2002.
Carbapenem-resistant Acinetobacter spp. used to be rare, but are increasingly isolated in Korea. Among 28 isolates of imipenem-resistant Acinetobacter spp. found in a Korean hospital in 1998 and 1999, 14 produced metallo-b-lactamases. The blaVIM-2 gene was detected, by PCR, in 11 and two isolates of Acinetobacter baumannii and Acinetobacter genomospecies 3, respectively, and blaIMP-1 in one isolate of A. baumannii. The MICs of imipenem for the isolates were 832 mg/L. PFGE analysis of SmaI-digested genomic DNA gave identical patterns in eight of 11 blaVIM-2-positive A. baumannii isolates from respiratory specimens of ICU patients. The blaVIM-2 gene cassettes in the isolates are identical to those from Pseudomonas aeruginosa isolates in Europe, but are inserted into new class I integrons In105 and In106. The attC site of the last cassette of the array in In106 is interrupted by the insertion of a putative class II intron. This is the first report of VIM-2 b-lactamase-producing A. baumannii and Acinetobacter genomospecies 3. Production of the VIM-2 enzyme presents an emerging threat of carbapenem resistance among Acinetobacter spp. in Korea.
* Correspondence address. Department of Clinical Pathology, Yonsei University College of Medicine, 134 Shinchon-dong, Seodaemun-gu, Seoul 120-752, Korea. Tel: +82-2-361-5866; Fax: +82-2-313-0956; E-mail: leekcp{at}yumc.yonsei.ac.kr
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