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Journal of Clinical Microbiology, June 2005, p. 2962-2964, Vol. 43, No. 6
0095-1137/05/$08.00+0     doi:10.1128/JCM.43.6.2962-2964.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Quinolone-Resistant Uropathogenic Escherichia coli Strains from Phylogenetic Group B2 Have Fewer Virulence Factors than Their Susceptible Counterparts

Juan P. Horcajada,1* Sara Soto,2 Abby Gajewski,3,{dagger} Alex Smithson,1 M. Teresa Jiménez de Anta,2 Josep Mensa,1 Jordi Vila,2 and James R. Johnson3

Service of Infectious Diseases,1 Service of Microbiology, Hospital Clínic Universitari-IDIBAPS, Barcelona, Spain,2 Medical Service, VA Medical Center, Minneapolis, Minnesota, and Department of Medicine, University of Minnesota, Minneapolis, Minnesota3

Received 2 October 2004/ Returned for modification 6 December 2004/ Accepted 4 February 2005

The prevalence of 31 virulence factors was analyzed among nalidixic acid-susceptible and -resistant Escherichia coli strains from phylogenetic group B2. Hemolysin, cytotoxic necrotizing factor 1, and S and F1C fimbriae genes were less prevalent among nalidixic acid-resistant E. coli strains. Quinolone resistance may be associated with a decrease in the presence of some virulence factors.

* Corresponding author. Mailing address: Service of Infectious Diseases, Hospital Clínic Universitari-IDIBAPS, Villaroel 170, 08036 Barcelona, Spain. Phone: 34 932 275708. Fax: 34 934 514438. E-mail: jhorcaja{at}yahoo.es.

{dagger} Current address: Aerotek Scientific, St. Paul, MN.

Journal of Clinical Microbiology, June 2005, p. 2962-2964, Vol. 43, No. 6
0095-1137/05/$08.00+0     doi:10.1128/JCM.43.6.2962-2964.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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