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Antimicrobial Agents and Chemotherapy, December 2004, p. 4929-4930, Vol. 48, No. 12
0066-4804/04/$08.00+0     DOI: 10.1128/AAC.48.12.4929-4930.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

LETTER TO THE EDITOR

First Detection of a Carbapenem-Hydrolyzing Metalloenzyme in an Enterobacteriaceae Isolate in France

Top Letter References

 
Although many ß-lactamases with expanded spectra have been described for the Enterobacteriaceae, carbapenemases remain infrequent. Acquired carbapenemases of the metalloenzyme group (Ambler class B) are mostly either of the IMP or the VIM type. The VIM enzymes were reported first from Verona in Italy (VIM-1) and are scattered now in southern Europe, South America, and Southeast Asia (6). Our group had identified the first VIM enzyme (VIM-2) in France from Pseudomonas aeruginosa isolates (8), and we report now the first Ambler class B carbapenemase in a Klebsiella pneumoniae isolate from this same country.

K. pneumoniae MF was recovered from a 62-year-old man who had been hospitalized for liver transplantation. In the follow-up to the surgery, he developed liver abscesses and peritonitis. Two identical isolates were recovered from liver abscesses and peritoneal fluid, respectively. They were resistant to all available antibiotics except colimycin. After surgical peritoneal lavage and treatment with colimycin, gentamicin, and metronidazole, the patient recovered.

The MICs of ß-lactams for K. pneumoniae MF were determined by agar dilution and interpreted as recommended elsewhere (5). Strain MF was resistant to all ß-lactams (Table 1). A synergy was found between aztreonam and clavulanic acid on a double-disk synergy test (data not shown). A ß-lactamase extract from a culture of strain MF subjected to analytical isoelectric focusing (8) showed three ß-lactamases with pI values of 5.1, 7.6, and 8.2. This culture extract had significant imipenem hydrolysis activity (1.8 U/mg) (8).

View this table: [in this window] [in a new window]

TABLE 1. MICs of ß-lactams for K. pneumoniae MF and E. coli transformants

Plasmid analysis detected four plasmids (160, 140, 130, and 3 kb) in strain MF. With the use of ampicillin (100 µg/ml) and sodium azide (100 µg/ml; Sigma-Aldrich, Saint-Quentin-Fallavier, France) as selective agents and Escherichia coli J53Az^r as the recipient strain (3), the 160-kb plasmid was only self-conjugative whereas the 140-kb plasmid carried also an ampicillin resistance determinant that was transferred only after electroporation. With the use of a series of primers for detection of class A and class B ß-lactamase genes (7, 8), PCR experiments followed by sequencing identified a ß-lactamase gene coding for the carbapenemase VIM-1 (pI 5.1) on the 160-kb plasmid whereas the gene coding for the class A expanded-spectrum ß-lactamase SHV-5 (pI 8.2) was identified on the 140-kb plasmid. Both genes have been identified repeatedly in Greece (2, 4, 7, 9).

Then, identification of the sequences surrounding the bla_VIM-1 gene found a class 1 integron that was similar to those reported for VIM-1-producing E. coli and K. pneumoniae isolates in Greece and different from those of other parts of the world (2, 4). In addition in the present case, an IS26 element was identified just downstream of the integrase gene of the integron. IS26 has been involved in expression and possible mobilization of a series of different ß-lactamase genes (1).

Finally, this report underlines the requirement to analyze in detail the molecular mechanisms underlying a multidrug resistance phenotype. This is the first case of a simultaneous occurrence of ß-lactamases VIM-1 and SHV-5, which may indicate the ongoing evolution of the spread of metallo-ß-lactamase genes not only in the Pseudomonaceae but also in the Enterobacteriaceae.

 
This work was funded by a grant from the Ministère de l'Education Nationale et de la Recherche (UPRES-EA3539), Université Paris XI, France, and by a grant from the European Community (6th PCRD, LSHM-CT-2003-503335).

Top Letter References

 

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1. Ford, P. J., and M. B. Avison. 2004. Evolutionary mapping of the SHV ß-lactamase and evidence for two separate IS26-dependent bla_SHV mobilization events from the Klebsiella pneumoniae chromosome. J. Antimicrob. Chemother. 54:69-75.[Abstract/Free Full Text]
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2. Giakkoupi, P., A. Xanthaki, M. Kanelopoulu, A. Vlahaki, V. Miragou, S. Kontou, E. Papafraggas, H. Malamou-Lada, L. S. Tzouvelekis, N. J. Legakis, and A. C. Vatopoulos. 2003. VIM-1 metallo-ß-lactamase-producing Klebsiella pneumoniae strains in Greek hospitals. J. Clin. Microbiol. 41:3893-3896.[Abstract/Free Full Text]
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3. Martinez-Martinez, L., A. Pascual, and G. A. Jacoby. 1998. Quinolone resistance from a transferable plasmid. Lancet 351:797-799.[CrossRef][Medline]
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4. Miriagou, V., E. Tzelepi, D. Gianneli, and L. S. Tzouvelekis. 2003. Escherichia coli with a self-transferable, multiresistant plasmid coding for metallo-ß-lactamase VIM-1. Antimicrob. Agents Chemother. 47:395-397.[Abstract/Free Full Text]
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5. National Committee for Clinical Laboratory Standards. 2003. Methods for dilution antimicrobial susceptibility tests for bacteria that grow aerobically, p. 1. Approved standard M7-A6. National Committee for Clinical Laboratory Standards, Wayne, Pa.
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6. Nordmann, P., and L. Poirel. 2002. Emerging carbapenemases in Gram negative aerobes. Clin. Microbiol. Infect. 8:321-331.[CrossRef][Medline]
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7. Poirel, L., E. Lebessi, M. Castro, C. Fevre, M. Foustoukou, and P. Nordmann. 2004. Nosocomial outbreak of extended-spectrum ß-lactamase SHV-5-producing isolates of Pseudomonas aeruginosa in Athens, Greece. Antimicrob. Agents Chemother. 48:2277-2279.[Abstract/Free Full Text]
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8. Poirel, L., T. Naas, D. Nicolas, L. Collet, S. Bellais, J.-D. Cavallo, and P. Nordmann. 2000. Characterization of VIM-2, a carbapenem-hydrolyzing metallo-ß-lactamase and its plasmid and integron-borne gene from a Pseudomonas aeruginosa clinical isolate in France. Antimicrob. Agents Chemother. 44:891-897.[Abstract/Free Full Text]
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9. Scoulica, E. V., I. K. Neonakis, A. I. Gikas, and Y. J. Tselentis. 2004. Spread of bla_VIM-1-producing E. coli in an university hospital in Greece. Genetic analysis of the integron carrying the bla_VIM-1 metallo-ß-lactamase gene. Diagn. Microbiol. Infect. Dis. 48:167-172.

						Marie-Frédérique Lartigue Laurent Poirel Patrice Nordmann* Service de Bactériologie-Virologie Hôpital de Bicêtre Assistance Publique/Hôpitaux de Paris Faculté de Médecine Paris-Sud Université Paris XI 94275 Le Kremlin-Bicêtre, France
						* Phone: 33-1-45-21-36-32, Fax: 33-1-45-21-63-40, E-mail: nordmann.patrice{at}bct.ap-hop-paris.fr

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Antimicrobial Agents and Chemotherapy, December 2004, p. 4929-4930, Vol. 48, No. 12
0066-4804/04/$08.00+0     DOI: 10.1128/AAC.48.12.4929-4930.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

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