title: In vitro activity of clinafloxacin in comparison with other quinolones against Stenotrophomonas maltophilia clinical isolates in the presence and absence of reserpine.
abstract: A total of 33 Stenotrophomonas maltophilia clinical isolates were tested for their susceptibility to clinafloxacin in comparison with ciprofloxacin, levofloxacin, moxifloxacin, nalidixic acid, norfloxacin, sparfloxacin and trovafloxacin. The MIC(50) and MIC(90) were as follows: ciprofloxacin 4 and 64 microg/mL; clinafoxacin 0.5 and 4 microg/mL; levofloxacin 2 and 32 microg/mL; moxifloxacin 1 and 8 microg/mL; nalidixic acid 8 and 128 microg/mL; norfloxacin 64 and 256 microg/mL; sparfloxacin 1 and 16 microg/mL; and trovafloxacin 1 and 8 microg/mL. Clinafloxacin was the most active quinolone, with only a 15.1% of strains showing resistance. When the MICs were determined in the presence of 25 microg/ml of reserpine, the MIC(90) of trovafloxacin and moxifloxacin did not change, whereas decreased 2-fold for clinafloxacin, levofloxacin, sparfloxacin and nalidixic acid, and 4- and 8-fold for ciprofloxacin and norfloxacin respectively. No clinafloxacin-resistant strains were observed when the MIC was performed in the presence of reserpine. Therefore, clinafloxacin shows the better "in vitro"activity against these 33 strains of S.maltophilia.
authors.affiliation: Institut d'Infeccions i Immunologia, Hospital Clínic, IDIBAPS, Facultat de Medicina, Universitat de Barcelona, Villarroel 170, 08036-, Barcelona, Spain. vila@medicina.ub.es
authors.forename: Anna
authors.initials: A
authors.lastname: Ribera
authors.forename: Angels
authors.initials: A
authors.lastname: Jurado
authors.forename: Joaquim
authors.initials: J
authors.lastname: Ruiz
authors.forename: Francesc
authors.initials: F
authors.lastname: Marco
authors.forename: Oscar
authors.initials: O
authors.lastname: Del Valle
authors.forename: Josep
authors.initials: J
authors.lastname: Mensa
authors.forename: Josep
authors.initials: J
authors.lastname: Chaves
authors.forename: Gonzalo
authors.initials: G
authors.lastname: Hernández
authors.forename: M Teresa
authors.initials: MT
authors.lastname: Jiménez de Anta
authors.forename: Jordi
authors.initials: J
authors.lastname: Vila
mesh_terms: D000890:Anti-Infective Agents / Q000494:pharmacology*; D024881:Drug Resistance, Bacterial; D024841:Fluoroquinolones; D016905:Gram-Negative Bacterial Infections / Q000382:microbiology; D006801:Humans; D008826:Microbial Sensitivity Tests / Q000379:methods / Q000639:trends; D012110:Reserpine / Q000494:pharmacology*; D020615:Stenotrophomonas maltophilia / Q000187:drug effects*
chemical_list: D000890:Anti-Infective Agents; D024841:Fluoroquinolones; D012110:Reserpine; C057477:clinafloxacin