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Escherichia coli sequence type 131 (ST131) producing extended-spectrum b-lactamases (ESBLs) is emerging as a worldwide pandemic clone causing community and hospital-acquired infections (Rogers et al., 2011). Among the ESBLs, CTX-M is the most prevalent in ST131, while TEM, SHV and CMY have been infrequently detected. Fluoroquinolone resistance is also common amongst ST131, and the aminoglycosidemodifying enzyme AAC(69)-Ib-cr, which also contributes to quinolone resistance, is frequently associated with ST131. However, the Qnr proteins mediating low-level quinolone resistance, such as QnrA, QnrB and QnrS, have been infrequently described in the ST131 clone (Pomba et al., 2009). During a local surveillance of multidrugresistant E. coli from humans and animals, an ST131 isolate carrying blaCTX-M-3, blaCTX-M-27 and qnrS1 genes was identified and is reported here.

Emergence of pandemic B2-O25b-ST131 Escherichia coli harbouring bla CTX-M-3, bla CTX-M-27 and qnrS1 genes