Diagnostic Microbiology & Infectious Disease
Volume 67, Issue 4 , Pages 380-383, August 2010

High percentage of resistance to ciprofloxacin and qnrB19 gene identified in urinary isolates of extended-spectrum β-lactamase–producing Escherichia coli in Madrid, Spain

Servicio de Microbiología, Hospital Clínico San Carlos, 28040 Madrid, Spain

Received 16 December 2009; accepted 16 March 2010.

Abstract 

The presence of qnr genes in 191 extended-spectrum β-lactamase–producing Escherichia coli from 2005, with 75% of resistance to ciprofloxacin, was evaluated. An SHV-12–producing E. coli carried qnrB19; both genes were transferred by conjugation. No qnrA- or qnrS-positive strains were detected. In addition, we identified 3 new parC mutations (S80W, E84R, and E84A).

Keywords: qnr, E. coli, Fluoroquinolone, Resistance

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 This work was presented at the 19th European Society of Clinical Microbiology and Infectious Diseases (ESCMID), Helsinki, Finland, May 2009.

PII: S0732-8893(10)00091-X

doi:10.1016/j.diagmicrobio.2010.03.007

Diagnostic Microbiology & Infectious Disease
Volume 67, Issue 4 , Pages 380-383, August 2010