Journal Article

First outbreak of multidrug-resistant <i>Klebsiella pneumoniae</i> carrying <i>bla</i><sub>VIM-1</sub> and <i>bla</i><sub>SHV-5</sub> in a French university hospital

Najiby Kassis-Chikhani, Dominique Decré, Valérie Gautier, Béatrice Burghoffer, Faouzi Saliba, Daniele Mathieu, Didier Samuel, Denis Castaing, Jean-Claude Petit, Elisabeth Dussaix and Guillaume Arlet

in Journal of Antimicrobial Chemotherapy

Published on behalf of British Society for Antimicrobial Chemotherapy

Volume 57, issue 1, pages 142-145
Published in print January 2006 | ISSN: 0305-7453
Published online November 2005 | e-ISSN: 1460-2091 | DOI: http://dx.doi.org/10.1093/jac/dki389
First outbreak of multidrug-resistant Klebsiella pneumoniae carrying blaVIM-1 and blaSHV-5 in a French university hospital

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Objectives: We studied eight imipenem-resistant isolates of Klebsiella pneumoniae involved in an outbreak in a French teaching hospital.

Methods: The eight isolates were recovered from clinical specimens or rectal swabs. Antibiotic susceptibilities were determined using standard agar diffusion and dilution methods including synergy tests. PFGE was used to study the relatedness of isolates. Genes encoding β-lactamases were characterized by transfer assays, specific amplification and cloning.

Results: The eight isolates were closely related by PFGE analysis and highly related to a K. pneumoniae strain from Greece. They were highly resistant to β-lactams, including aztreonam and imipenem (MIC ≥32 mg/L), and were positive by the imipenem-EDTA disc synergy test. Isolates were also resistant to aminoglycosides, newer quinolones and sulfamethoxazole, and showed an intermediate level of resistance to tetracycline. VIM-1 and SHV-5 β-lactamases were revealed in all isolates by PCR. The analysis of plasmid contents of Escherichia coli DH10B electroporants expressing the VIM-1 β-lactamase or the SHV-5 β-lactamase confirmed that the two enzymes were coded by two different plasmids. The blaVIM-1 gene was part of a class 1 integron that also included aac6, dhfrI and aadA genes and was similar to those reported from strains isolated in Greece.

Conclusions: This study confirms the potential risk of spread of multiresistant bacteria with international transfer of patients.

Keywords: imipenem resistance; class I integrons; liver transplants

Journal Article.  2047 words.  Illustrated.

Subjects: Medical Oncology ; Critical Care

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