title: [Susceptibility and molecular mechanisms of resistance to cephalosporins of Escherichia coli strains isolated from patients with nosocomial infections].
abstract: Resistance to wide spectrum of antibiotics was studied and most widespread genetic determinants of resistance to beta-lactam antibiotics were revealed. Susceptibility testing was performed using serial broth microdilution method. Detection of class A expanded spectrum beta-lactamases genes (TEM, SHV, CTX) by polymerase-chain reaction method was performed in 90 strains. Carbapenems remained the most active antibacterial agents with respect to studied E. coli strains. Among the 3rd generation cephalosporins the lowest minimal inhibitory concentrations were observed for inhibition-protected combined agents (ceftazidime/clavulanic acid and cefoperazone/ sulbactam). Alone or in various combinations TEM, SHV, and CTX types of beta-lactamases were found in 58.9%, 14.4%, and 77.8% of strains. Combinations of 2 determinants were detected in 55.6% of the isolates, and all 3 determinants--in 5.6%. Most often E. coli was isolated in patients with urinary tract infections. Carbapenems and inhibition-protected combined 3rd generation cephalosporins are the most active agents against E. coli.
authors.forename: D V
authors.initials: DV
authors.lastname: Ivanov
authors.forename: I V
authors.initials: IV
authors.lastname: Krapivina
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D015780:Carbapenems / Q000494:pharmacology; D002438:Cefoperazone / Q000494:pharmacology; D002442:Ceftazidime / Q000494:pharmacology; D018550:Cephalosporin Resistance / Q000235:genetics; D002511:Cephalosporins / Q000494:pharmacology; D019818:Clavulanic Acid / Q000494:pharmacology; D003428:Cross Infection / Q000382:microbiology*; D004352:Drug Resistance, Microbial / Q000235:genetics; D004926:Escherichia coli / Q000187:drug effects* / Q000235:genetics; D004927:Escherichia coli Infections / Q000382:microbiology*; D005798:Genes, Bacterial / Q000235:genetics; D006801:Humans; D008826:Microbial Sensitivity Tests; D016133:Polymerase Chain Reaction; D014552:Urinary Tract Infections / Q000382:microbiology; D001618:beta-Lactamases / Q000235:genetics; D047090:beta-Lactams / Q000494:pharmacology*
chemical_list: D000900:Anti-Bacterial Agents; D015780:Carbapenems; D002511:Cephalosporins; D047090:beta-Lactams; D019818:Clavulanic Acid; D002438:Cefoperazone; D002442:Ceftazidime; C084251:beta-lactamase TEM-10; D001618:beta-Lactamases