title: Antibacterial activity of fluoroquinolones local clinical isolates from a referral center in Riyadh.
abstract: A total of 1,034 clinical isolates from a tertiary care center were tested against six fluoroquinolones, namely norfloxacin, ciprofloxacin, lomefloxacin, sparfloxacin, temafloxacin, and CI-960. Bacteria tested consisted of 579 strains of Enterobacteriaceae, 98 pseudomonads, 51 Acinetebacter, 56 enterococci and 250 isolates of staphylococci. All six fluoroquinolones showed excellent in vitro activity inhibiting >90% of Escherichia coli at an MIC of < 0.03-0.5 mg/L, Klebsiella pneumoniae at 0.12-2.0 mg/L, Enterobacter at 0.12-2.0 mg/L, Serratia marcescens at 0.12-2.0 mg/L, Pseumodonas aeruginosa at 0.5-2.0 mg/L, Staphylococcus aureus at < 0.03-1.0 mg/L, and coagulase negative staphylococci at an MIC of 0.12-2.0 mg/L Xanthomonas maltophilia showed some resistance to norfloxacin, ciprofloxacin, lomefloxacin and temafloxacin, but was inhibited by sparfloxacin and CI-960. A majority of isolates of enterococci were resistant to norfloxacin, ciprofloxacin, lomefloxacin, and CI-960, but sparfloxacin and temafloxacin inhibited 92% and 82% of these strains, respectively.
authors.affiliation: Department of Pathology and Laboratory Medicine, King Faisal Specialist Hospital and Research Centre, Riyadh, Saudi Arabia.
authors.forename: S M
authors.initials: SM
authors.lastname: Qadri
authors.forename: J
authors.initials: J
authors.lastname: Akhter
authors.forename: Y
authors.initials: Y
authors.lastname: Ueno