Molecular epidemiology of extended-spectrum beta-lactamase-producing Escherichia coli in Tunisia and characterization of their virulence factors and plasmid addiction systems

BMC Microbiology

Adnene Hammami¹  Guillaume Arlet³  Nathalie Genel³  Faouzia Mahjoubi¹  Jihène Jdidi²  Hela Harhour¹  Basma Mnif¹ 

[1] Laboratoire de Microbiologie-Faculté de Médecine de Sfax, Avenue Majida Boulila, 3027, Sfax, Tunisie;Service de médecine préventive, Hôpital Hédi Chaker, Sfax, Tunisie;Faculté de Médecine, Site Saint-Antoine, Laboratoire de Bactériologie, Université Pierre et Marie Curie-Paris-6, Paris, France

关键词: Virulence;    Addiction systems;    Plasmid;    CTX-M-15;    ESBL;    E. coli;   

Others  :  1143567
DOI  :  10.1186/1471-2180-13-147

 received in 2013-03-28, accepted in 2013-05-27,  发布年份 2013

【 摘 要 】

Background

Extended-spectrum β-lactamases (ESBLs), particularly CTX-M- type ESBLs, are among the most important resistance determinants spreading worldwide in Enterobacteriaceae. The aim of this study was to characterize a collection of 163 ESBL-producing Escherichia coli collected in Tunisia, their ESBL-encoding plasmids and plasmid associated addiction systems.

Results

The collection comprised 163 ESBL producers collected from two university hospitals of Sfax between 1989 and 2009. 118 isolates harbored bla_CTX-M gene (101 bla_CTX-M-15 gene and 17 bla_CTX-M-14 gene). 49 isolates carried bla_SHV-12 gene, 9 bla_SHV-2a gene and only 3 bla_TEM-26 gene. 16 isolates produced both CTX-M and SHV-12. The 101 CTX-M-15-producing isolates were significantly associated to phylogroup B2 and exhibiting a high number of virulence factors. 24 (23.7%) of the group B2 isolates belonged to clonal complex ST131. Pulsed-field gel electrophoresis (PFGE) typing revealed a genetic diversity of the isolates. 144 ESBL determinants were transferable mostly by conjugation. The majority of plasmid carrying blaCTX-M-15 genes (72/88) were assigned to various single replicon or multireplicon IncF types and had significantly a higher frequency of addiction systems, notably the VagCD module.

Conclusion

This study demonstrates that the dissemination of CTX-M-15 producing E. coli in our setting was due to the spread of various IncF-type plasmids harboring multiple addiction systems, into related clones with high frequency of virulence determinants.

【 授权许可】

   
2013 Mnif et al.; licensee BioMed Central Ltd.

【 图 表 】

Figure 1.

Figure 2.

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