1. Martinez-Martinez L, Pascual A, Jacoby GA. Quinolone resistance from a transferable plasmid. Lancet 1998; 351: 797–9. 2. Robicsek A, Jacoby GA, Hooper DC. The worldwide emergence of plasmid-mediated quinolone resistance. Lancet Infect Dis 2006; 6: 629–40. 3. Yamane K, Wachino J, Suzuki S et al. New plasmid-mediated fluoroquinolone pump, QepA, found in an Escherichia coli clinical isolate. Antimicrob Agents Chemother 2007; 51: 3354–60. 4. Gay K, Robicsek A, Strahilevitz J et al. Plasmid-mediated quinolone resistance in non-Typhi serotypes of Salmonella enterica. Clin Infect Dis 2006; 43: 297–304. 5. Cavaco LM, Hendriksen RS, Aarestrup FM. Plasmid-mediated quinolone resistance determinant qnrS1 detected in Salmonella enterica serovar Corvallis strains isolated in Denmark and Thailand. J Antimicrob Chemother 2007; 60: 704–6. 6. Hopkins KL, Day M, Threlfall EJ. Plasmid-mediated quinolone resistance in Salmonella enterica, United Kingdom. Emerg Infect Dis 2008; 14: 340–2. 7. Hakanen A, Kotilainen P, Jalava J et al. Detection of decreased fluoroquinolone susceptibility in salmonellas and validation of nalidixic acid screening test. J Clin Microbiol 1999; 37: 3572–7. 8. Aarestrup FM, Wiuff C, Molbak K et al. Is it time to change fluoroquinolone breakpoints for Salmonella spp.? Antimicrob Agents Chemother 2003; 47: 827–9.