title: [In vitro activity of sitafloxacin against clinical isolates in 2012].
abstract: In vitro activity of sitafloxacin (STFX) and various oral antimicrobial agents against bacterial isolates recovered from clinical specimens between January and December 2012, at different healthcare facilities in Japan was evaluated. A total of 1,620 isolates including aerobic and anaerobic organisms were available for the susceptibility testing using the microbroth dilution methods recommended by Clinical and Laboratory Standards Institute. The minimum inhibitory concentration of STFX at which 90% of isolates (MIC90) was 0.5 microg/mL for methicillin-susceptible Staphylococcus aureus and was 2 times lower than that of garenoxacin (GRNX), 4 times lower than that of moxifloxacin (MFLX), and 16 times lower than that of levofloxacin (LVFX). STFX inhibited the growth of all the isolates of Streptococcus pneumoniae at 0.06 microg/mL or less. The MIC90 of STFX was 0.03 microg/mL and was 2 times lower than that of GRNX, 4 times lower than that of MFLX, and 32 times lower than that of LVFX. Against Streptococcus pyogenes, the MIC90 of STFX was 0.06 microg/mL and was 2 times lower than that of GRNX, 8 times lower than that of MFLX, and 32 times lower than that of LVFX. The MIC90 of STFX was 2 microg/mL for Enterococcus faecalis, and was 4 times lower than that of GRNX, 8 times lower than that of MFLX, and 32 times lower than that of LVFX. The MIC90 of STFX for Escherichia coli was 2 microg/mL, and the MIC90(s) of other 10 species of Enterobacteriaceae which were the lowest values of the quinolones tested ranged from 0.03 to 1 microg/mL. The MIC90 of STFX for Pseudomonas aeruginosa isolates recovered from urinary infections was 4 microg/mL and was 32 times lower than those of GRNX, MFLX and LVFX. The MIC90 of STFX for P. aeruginosa isolates recovered from respiratory infections was 4 microg/mL and was 8 to 16 times lower than those of GRNX, MFLX, and LVFX. STFX inhibited the growth of all the isolates of Haemophilus influenzae at 0.004 microg/mL or less, and was 4 times lower than that of GRNX, 16 times lower than that of MFLX, and 8 times lower than that of LVFX. The MIC90 of STFX was 0.015 microg/mL for Moraxella catarrhalis, and was equal to that of GRNX, 4 times lower than those of MFLX and LVFX. The MIC90(s) of STFX ranged from 0.03 to 0.25 microg/mL for all the species of anaerobic bacteria and were the lowest values of all the antimicrobial agents tested. In conclusion, the activity of STFX against Gram-positive cocci was comparable or superior to those of GRNX, MFLX and LVFX. STFX showed the most potent activity against Gram-negative bacteria and anaerobic bacteria of all the antimicrobial agents tested in this study.
authors.forename: Ayako
authors.initials: A
authors.lastname: Amano
authors.forename: Kaoru
authors.initials: K
authors.lastname: Matsuzaki
authors.forename: Naoko
authors.initials: N
authors.lastname: Kishi
authors.forename: Hideaki
authors.initials: H
authors.lastname: Koyama
authors.forename: Miyuki
authors.initials: M
authors.lastname: Hasegawa
authors.forename: Fumiaki
authors.initials: F
authors.lastname: Ikeda
authors.forename: Takuyuki
authors.initials: T
authors.lastname: Matsumoto
authors.forename: Hiroki
authors.initials: H
authors.lastname: Yamaguchi
authors.forename: Yukihiro
authors.initials: Y
authors.lastname: Okutani
mesh_terms: D000900:Anti-Bacterial Agents / Q000494:pharmacology*; D001419:Bacteria / Q000187:drug effects*; D001421:Bacteria, Anaerobic / Q000187:drug effects; D024841:Fluoroquinolones / Q000494:pharmacology*; D006090:Gram-Negative Bacteria / Q000187:drug effects; D006095:Gram-Positive Cocci / Q000187:drug effects; D006801:Humans; D008826:Microbial Sensitivity Tests
chemical_list: D000900:Anti-Bacterial Agents; D024841:Fluoroquinolones; C076246:sitafloxacin