Interplay between pathogenicity island carriage, resistance profile and plasmid acquisition in uropathogenic Escherichia coli.

This study aimed to characterize the relationship between pathogenicity islands (PAIs), single virulence genes and resistance among uropathogenic Escherichia coli, evaluating the resistance plasmid carriage fitness cost related to PAIs. For 65 urinary E. coli, antimicrobial susceptibility and extended-spectrum β-lactamase production were determined with the Vitek 2 Advanced Expert system.

Virulence and plasmidic resistance determinants of Escherichia coli isolated from municipal and hospital wastewater treatment plants.

Escherichia coli is simultaneously an indicator of water contamination and a human pathogen. This study aimed to characterize the virulence and resistance of E. coli from municipal and hospital wastewater treatment plants (WWTPs) in central Portugal.

Occurrence of extended-spectrum beta-lactamases in human and bovine isolates of Escherichia coli from Oyo state, Nigeria.

Introduction: The main objective of the study was the molecular characterization of extended spectrum β-lactamases (ESBL) in Escherichia coli isolates collected from human and bovine samples in Oyo state, Nigeria.

Methodology: Between August 2010-2011, 114 E. coli isolates were collected from hospitals (n = 57) and bovine (n = 57).

Molecular characterization of Klebsiella pneumoniae isolated from renal transplanted patients: virulence markers, extended-spectrum β-lactamases, and genetic relatedness.

The objective was to characterize virulence markers and β-lactam resistance in Klebsiella pneumoniae isolates from renal transplant patients and to evaluate their genetic relatedness. Two main genetic lineages were detected: 1 carried bla(CTX-M-15) not associated to IncFIIA plasmid replicon, which was found on the other lineage not expressing CTX-M-type enzyme. PAI III(536) and PAI II(CFT073) were detected for the first time in K.

Prevalent combination of virulence and plasmidic-encoded resistance in ST 131 Escherichia coli strains.

Escherichia coli ST131 is an important cause of multidrug-resistant infections. Thus, the aim of this study was to evaluate the concomitant presence of resistance plasmids and pathogenicity islands (PAIs) in ST131 E. coli.