title: Characterization of antimicrobial resistance patterns and class 1  integrons in Escherichia coli O26 isolated from humans and animals.
abstract: Antimicrobial resistance patterns and the prevalence of antimicrobial resistance genes and class 1 integrons in 35 Escherichia coli O26 isolated from humans and food-producing animals were evaluated. All isolates were resistant to cefaclor, cefalothin and sulfonamide and were susceptible to amikacin, gentamicin, cefmetazole, cefotaxime, ceftriaxone, ciprofloxacin, norfloxacin and trimethoprim. Most isolates were resistant to aztreonam, ampicillin, tetracycline, streptomycin and kanamycin. All ampicillin- and streptomycin-resistant E. coli O26 carried ampC and strA-strB gene sequences, respectively. Florfenicol- and chloramphenicol-resistant isolates carried floR but not cmlA. Class1 integrons were identified in 14% of E. coli O26 isolates. To our knowledge, this is the first report describing the presence of multiple antimicrobial resistance genes in E. coli O26 isolated from human and animal origins.
authors: Food Safety Center of Excellence and Department of Animal Science, The University of Tennessee, Knoxville, TN 37996, USA.
authors: Velusamy
authors: V
authors: Srinivasan
authors: Barbara E
authors: BE
authors: Gillespie
authors: Lien T
authors: LT
authors: Nguyen
authors: Susan I
authors: SI
authors: Headrick
authors: Shelton E
authors: SE
authors: Murinda
authors: Stephen P
authors: SP
authors: Oliver
mesh_terms: D000818:Animals; D001483:Base Sequence; D017931:DNA Primers / Q000235:genetics; D004269:DNA, Bacterial / Q000235:genetics / Q000302:isolation & purification; D024881:Drug Resistance, Bacterial / Q000235:genetics*; D024901:Drug Resistance, Multiple, Bacterial / Q000235:genetics; D016521:Electrophoresis, Gel, Pulsed-Field; D004926:Escherichia coli / Q000145:classification / Q000187:drug effects* / Q000235:genetics* / Q000302:isolation & purification; D005798:Genes, Bacterial; D006801:Humans; D032023:Integrons / Q000235:genetics*; D008826:Microbial Sensitivity Tests
chemical_list: D017931:DNA Primers; D004269:DNA, Bacterial