Molecular characterization of metallo-β-lactamase-producing Acinetobacter baumannii and Acinetobacter genomospecies 3 from Korea: Identification of two new integrons carrying the blaVIM-2 gene cassettes

Jong Hwa Yum, Keonsoo Yi, Hyukmin Lee, Dongeun Yong, Kyungwon Lee, June Myung Kim, Gian Maria Rossolini, Yunsop Chong

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Abstract

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-β-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 8-32 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 β-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.

Original languageEnglish
Pages (from-to)837-840
Number of pages4
JournalJournal of Antimicrobial Chemotherapy
Volume49
Issue number5
Publication statusPublished - 2002 Jun 1

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All Science Journal Classification (ASJC) codes

  • Pharmacology
  • Microbiology (medical)
  • Infectious Diseases
  • Pharmacology (medical)

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