Molecular characterization of multiresistant Escherichia coli producing or not extended-spectrum β-lactamases

BMC Microbiology

Luis Martínez-Martínez⁴  Carmen Torres¹  Alessandra Carattoli²  Beatriz Guerra⁵  Elena Jesús Román³  Laura Vinué¹  Belén Ruiz del Castillo³ 

[1] Área de Bioquímica y Biología Molecular, Universidad de La Rioja, Logroño, Spain;Laboratory of Bacteriology and Medical Mycology, Istituto Superiore di Sanita, Rome, Italy;Service of Microbiology, Hospital Universitario Marqués de Valdecilla-IFIMAV, Av/ de Valdecilla s/n, Santander 39008, Spain;Department of Molecular Biology, University of Cantabria, Santander, Spain;Federal Institute for Risk Assessment, Berlin, Germany

关键词: Multiresistance;    ESBL;    Plasmids;    E. coli;   

Others  :  1143870
DOI  :  10.1186/1471-2180-13-84

 received in 2013-02-14, accepted in 2013-04-05,  发布年份 2013

【 摘 要 】

Background

The prevalence and type of plasmids, resistance genes and integrons carried by two collections of multiresistant E. coli producing or not extended-spectrum β-lactamases have been compared. Rep-PCR was used to determine the clonal relationship of the organisms. Plasmids were classified according to their incompatibility. Class 1 and Class 2 integrons and antibiotic resistance genes were analysed by PCR and sequencing.

Results

Both collections of organisms contained a large diversity of unrelated strains with some clones distributed in both groups of isolates. Large plasmids were identified in the two groups of organisms. Plasmids with replicons repK and repColE were more frequent among ESBL-producing isolates, while repFIA, repFII and repA/C replicons were more frequent in isolates lacking ESBL. Conjugative plasmids with repK and repA/C replicons coded for CTX-M-14 and CMY-2 β-lactamases, respectively. No significant differences were observed in the distribution of class 1 and class 2 integrons among multiresistant E. coli producing or not ESBL, and dfrA17-ant(3″)-Ie was the cassette arrangement most commonly found.

Conclusions

In the concrete temporal and geographical context of this study, multiresistant E. coli producing ESBL or other mechanisms of resistance were largely clonally diverse and present some differences in the types of harboured plasmids. Still, some clones were found in both ESBL-producing and –lacking isolates.

【 授权许可】

   
2013 Ruiz del Castillo et al.; licensee BioMed Central Ltd.

【 图 表 】

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