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Open AccessArticle

CTX-M-Producing Escherichia coli in Lithuania: Associations Between Sites of Infection, Coresistance, and Phylogenetic Groups

1
Department of Microbiology, Medical Academy, Lithuanian University of Health Sciences, Lithuania
2
Department of Laboratory Medicine, Medical Academy, Lithuanian University of Health Sciences, Lithuania
3
Laboratory of Neuro-oncology and Genetics, Neuroscience Institute, Lithuanian University of Health Sciences, Lithuania
4
Laboratoire de Bacteriologie, UFR de Médecine, Universite Pierre et Marie Curie Paris 6, France
5
Service de Bacteriologie, Hopital Tenon AP-HP, France
*
Authors to whom correspondence should be addressed.
Medicina 2013, 49(9), 61; https://doi.org/10.3390/medicina49090061
Received: 20 August 2013 / Accepted: 30 September 2013 / Published: 5 October 2013
Increasing resistance of Escherichia coli (E. coli) to antibiotics, especially to the third-generation cephalosporins, has prompted studies on widespread resistance genes such as blaCTX-M and differentiation of E. coli to phylogenetic groups. The aim of this study was to determine the associations between the CTX-M type and the phylogenetic group, the site of infection, and coresistance in Lithuanian E. coli isolates producing β-lactamases.
Material and Methods
. A total of 90 E. coli ESBL strains were recovered from the lower respiratory tract, the urinary tract, sterile body sites, wounds, and other body sites between 2008 and 2012. The E. coli isolates resistant to at least 2 antibiotics with different modes of action along with resistance to cefotaxime were considered as multiresistant. The blaCTX-M, blaTEM, blaOXA-1, and blaSHV genes, the phylogenetic groups, and the resistance profiles were analyzed.
Results. Of the 90 isolates, 84 (93.3%) were classified as multiresistant and 6 (6.6%) as resistant. The blaCTX-M-15 gene was the most prevalent gene followed by the blaCTX-M-14 and blaCTX-M-92 genes. The logistic regression analysis revealed the associations between CTX-M-15 and resistance to ceftriaxone, between CTX-M-14 and resistance to cefoxitin, aztreonam, ampicillin/sulbactam, ticarcillin/clavulanic acid, and tobramycin, and between CTX-M-92 and resistance to cefepime, piperacillin/tazobactam, gentamicin, and tobramycin.
Conclusions. The results of this study showed a significant association between CTX-M-15, CTX-M-14, and CTX-M-92 β-lactamases and resistance to some antibiotics as well as CTX‑M-14 β-lactamase and phylogenetic group A in the Lithuanian population. The associations between the CTX-M type and the site of infection were not determined.
Keywords: phylogenetic groups; site of infection; multiresistance; E. coli isolates; CTX-M phylogenetic groups; site of infection; multiresistance; E. coli isolates; CTX-M
MDPI and ACS Style

Giedraitienė, A.; Vitkauskienė, A.; Ašmonienė, V.; Plančiūnienė, R.; Šimonytė, S.; Pavilonis, A.; Arlet, G. CTX-M-Producing Escherichia coli in Lithuania: Associations Between Sites of Infection, Coresistance, and Phylogenetic Groups. Medicina 2013, 49, 61.

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