title: Emergence of uropathogenic extended-spectrum beta lactamases-producing Escherichia coli strains in the community.
abstract: The aim of this study was to determine the virulence characteristics and resistance pattern of the extended-spectrum/lactamases (ESBLs)-producing Escherichia coli strains isolated from urine of outpatients in the Zagreb region during a five-month period, and to compare them with the non ESBLs-producing E. coli strains isolated in the same period. Out of 2451 E. coli strains isolated from urine of nonhospitalized patients with significant bacteriuria, a total of 39 ESBLs-producing strains (1.59%) were detected by a double-disk diffusion technique and by the broth-dilution minimal inhibitory concentration reduction method. The 45 non ESBLs-producing strains were randomly chosen, and phenotype of the two groups of strains was characterized and compared. Serogroup O4, hemolysin production, expression of P- and type 1 fimbriae as well as resistance to gentamicin and amikacin were significantly more prevalent characteristics among the ESBLs-producing strains than among non ESBLs-producing strains (p < 0.01), while higher prevalence of trimethoprim-sulfamethoxazole resistance among ESBLs-producing strains was not statistically significant (p > 0.05). Chromosomal DNA analysis by pulsed-field gel electrophoresis exhibited a great genomic similarity among ESBLs-producing strains and revealed that those highly virulent and resistant E. coli strains isolated from urine of outpatients in the Zagreb region had a clonal propagation.
authors.affiliation: Department of Microbiology, Zagreb Institute of Public Health, Zagreb, Croatia.
authors.forename: Tatjana
authors.initials: T
authors.lastname: Marijan
authors.forename: Jasmina
authors.initials: J
authors.lastname: Vranes
authors.forename: Branka
authors.initials: B
authors.lastname: Bedenić
authors.forename: Ana
authors.initials: A
authors.lastname: Mlinarić-Dzepina
authors.forename: Vanda
authors.initials: V
authors.lastname: Plecko
authors.forename: Smilja
authors.initials: S
authors.lastname: Kalenić
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002648:Child; D002675:Child, Preschool; D017714:Community-Acquired Infections / Q000382:microbiology*; D024881:Drug Resistance, Bacterial; D016521:Electrophoresis, Gel, Pulsed-Field; D004926:Escherichia coli / Q000187:drug effects* / Q000201:enzymology / Q000472:pathogenicity; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D014552:Urinary Tract Infections / Q000382:microbiology*; D001618:beta-Lactamases / Q000096:biosynthesis*
chemical_list: D001618:beta-Lactamases