Co-carriage of qnrS1, floR, and bla(CTX-M-14) on a multidrug-resistant plasmid in Escherichia coli isolated from pigs.

Plasmid-mediated quinolone resistance (PMQR) determinants were widely distributed among Enterobacteriaceae. The objectives of the present study were to analyze PMQR-positive Escherichia coli isolates from pigs, and to investigate the association between these determinants and other resistant genes. A total of 129 porcine E.

Increased prevalence of plasmid-mediated quinolone resistance determinants in chicken Escherichia coli isolates from 2001 to 2007.

To evaluate the temporal change in the plasmid-mediated quinolone resistance (PMQR) determinants from 2001 to 2007 in chicken, a total of 532 chicken Escherichia coli isolates were screened for PMQR determinants by polymerase chain reaction and sequencing. The prevalence of qnr genes, aa(6')-Ib-cr, and qepA were 9.8%, 11.