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LETTERS TO THE EDITOR

First Organisms with Acquired Metallo-β-Lactamases (IMP-13, IMP-22, and VIM-2) Reported in Austria

Wojciech Duljasz, Marek Gniadkowski, Silvia Sitter, Alexandra Wojna, Crista Jebelean
Wojciech Duljasz
Department of Molecular Microbiology National Medicines Institute 00-725 Warsaw, Poland
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Marek Gniadkowski
Department of Molecular Microbiology National Medicines Institute 00-725 Warsaw, Poland
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  • For correspondence: gniadkow@cls.edu.pl
Silvia Sitter
Klinisches Institut für Klinische Pathologie, Landeskrankenhaus Steyr 4400 Steyr, Austria
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Alexandra Wojna
Medizinisch Diagnostische Laboratorien Dr. Mustafa, Dr. Richter, Salzburg 5020 Salzburg, Austria
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Crista Jebelean
Institut für Hygiene, Mikrobiologie und Tropenmedizin Allgemein öffentliches Krankenhaus der Elisabethinen Linz 4010 Linz, Austria
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DOI: 10.1128/AAC.01573-08
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Metallo-β-lactamases (MBLs) hydrolyze penicillins, cephalosporins, and carbapenems. Organisms with acquired MBLs emerged in the late 1980s in Japan and since the mid-1990s have been identified worldwide. They include numerous species, with Pseudomonas aeruginosa playing the major role. Of several MBL families, VIM and IMP types are the most prevalent, being coded by gene cassettes inside class 1 integrons (4, 14, 17).

The first four MBL-producing P. aeruginosa isolates reported in Austria were identified in October to December 2007. Three isolates (22843, 26285, and 27135) were recovered in a hospital laboratory in Steyr which has tested all carbapenem-nonsusceptible P. aeruginosa isolates with Etest MBL (AB Biodisk, Solna, Sweden). The isolates gave the only positive results by the end of 2007 (774 P. aeruginosa isolates were recovered in 2007; 15% were carbapenem nonsusceptible). The last isolate (M136074) was identified in a laboratory in Salzburg collaborating with general practitioners and nine hospitals. All P. aeruginosa isolates with reduced susceptibilities to carbapenems, ticarcillin-clavulanate, and ceftazidime (MICs, ≥4, >16, and >8 μg/ml, respectively) have been analyzed with the MBL disk test (1), and M136074 has been the only positive isolate so far (361 P. aeruginosa isolates were recovered in 2007; 7% were carbapenem nonsusceptible). It was recovered from a wound of a nursing home resident with a hospitalization history in 2007. Susceptibility was determined by using Etest (Table 1). MBL detection was confirmed by the spectrophotometric assay (3) and the hyplex MBL ID system targeted at the blaIMP and blaVIM genes (BAG Health Care, Lich, Germany), which identified blaIMP genes in isolates 26285 and M136074 and blaVIM genes in isolates 22843 and 27135. Variable regions of class 1 integrons with MBL gene cassettes were sequenced as described previously (6). Isolate 26285 carried the blaIMP-13 and aacA4 cassettes, whereas isolate M136074 had a single cassette, blaIMP-22. Both blaIMP-13 and blaIMP-22 were originally identified in Italy, which reported the highest rate of IMPs in Europe, especially IMP-13 (15). The blaIMP-13-aacA4 array was indistinguishable from those in P. aeruginosa from Rome (16) and San Giovanni Rotondo, Italy (11). The blaIMP-22 cassette was identical to that in a Pseudomonas fluorescens strain from L'Aquila, Italy (EMBL/GenBank accession no. DQ361087) but was located in another integronic context. The isolates 22843 and 27135 contained the same array, aacA29a-blaVIM-2-aacA29b, as in integron In59 in P. aeruginosa from France (13), later found in P. aeruginosa in Sweden (a Greek patient) (7). The isolates were subjected to multilocus sequence typing, using the procedure and the database available at http://pubmlst.org (5, 8). The isolates 26285 (with IMP-13) and M136074 (with IMP-22) represented new sequence types, ST621 and ST620, respectively. While ST621 is a singleton, ST620 has single-locus variants from other countries (ST320, ST338, and ST520). The isolates 22843 and 27135 (VIM-2) were classified into ST111, a founder of the clonal complex CC4, corresponding to the major European P. aeruginosa clone P12 (9). P12 members express various resistance mechanisms, including MBLs (2, 7, 9, 10, 12). Interestingly, the “Greek-Swedish” isolate with In59 represented ST229, which also belongs to CC4 (7). The conjugation and hybridization assays, performed as described previously (6), suggested the chromosomal location of the MBL genes.

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TABLE 1.

Antimicrobial susceptibilities of MBL-producing P. aeruginosa isolates

This study revealed a remarkable diversity for the first MBL producers in Austria and a complex view of their genetic relationships with isolates from other European countries.

Nucleotide sequence accession number.

The blaIMP-22 gene cassette array sequence was assigned the EMBL database accession number FM876313.

ACKNOWLEDGMENTS

We thank L. Wassill and D. Ganghofner (AmplexDiagnostics GmbH) and A. Baraniak, K. Bojarska, and M. Herda for their assistance.

  • Copyright © 2009 American Society for Microbiology

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First Organisms with Acquired Metallo-β-Lactamases (IMP-13, IMP-22, and VIM-2) Reported in Austria
Wojciech Duljasz, Marek Gniadkowski, Silvia Sitter, Alexandra Wojna, Crista Jebelean
Antimicrobial Agents and Chemotherapy Apr 2009, 53 (5) 2221-2222; DOI: 10.1128/AAC.01573-08

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First Organisms with Acquired Metallo-β-Lactamases (IMP-13, IMP-22, and VIM-2) Reported in Austria
Wojciech Duljasz, Marek Gniadkowski, Silvia Sitter, Alexandra Wojna, Crista Jebelean
Antimicrobial Agents and Chemotherapy Apr 2009, 53 (5) 2221-2222; DOI: 10.1128/AAC.01573-08
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KEYWORDS

Bacterial Proteins
Pseudomonas aeruginosa
beta-lactam resistance
beta-lactamases
beta-lactams

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