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Comparative Study
Journal Article
Research Support, Non-U.S. Gov't
In vitro antimicrobial activity of S-649266, a catechol-substituted siderophore cephalosporin, when tested against non-fermenting Gram-negative bacteria.
Journal of Antimicrobial Chemotherapy 2016 March
OBJECTIVES: S-649266 is a parenteral siderophore cephalosporin antibiotic with a catechol moiety on its side chain. The in vitro antimicrobial activity of S-649266 against non-fermenting Gram-negative bacteria was evaluated and compared with the activities of meropenem, levofloxacin, cefepime, ceftazidime and piperacillin/tazobactam.
METHODS: MIC values of S-649266 were determined in Mueller-Hinton broth or Iso-Sensitest broth supplemented with apo-transferrin.
RESULTS: S-649266 showed potent in vitro activity against the non-fermenting Gram-negative bacteria Acinetobacter baumannii, Pseudomonas aeruginosa and Stenotrophomonas maltophilia, including MDR strains such as carbapenem-resistant A. baumannii and metallo-β-lactamase-producing P. aeruginosa. MIC90s of S-649266 for A. baumannii, P. aeruginosa and S. maltophilia were 2, 1 and 0.5 mg/L, respectively, whereas MIC90s of meropenem were >16 mg/L. S-649266 showed potent in vitro activities against A. baumannii producing carbapenemases such as OXA-type β-lactamases, and P. aeruginosa producing metallo-β-lactamases such as IMP type and VIM type. MIC90 values for these A. baumannii strains and P. aeruginosa strains were 8 and 4 mg/L, respectively.
CONCLUSIONS: S-649266 is a novel antibiotic with potent in vitro activity against a range of non-fermenting Gram-negative bacteria, including MDR strains.
METHODS: MIC values of S-649266 were determined in Mueller-Hinton broth or Iso-Sensitest broth supplemented with apo-transferrin.
RESULTS: S-649266 showed potent in vitro activity against the non-fermenting Gram-negative bacteria Acinetobacter baumannii, Pseudomonas aeruginosa and Stenotrophomonas maltophilia, including MDR strains such as carbapenem-resistant A. baumannii and metallo-β-lactamase-producing P. aeruginosa. MIC90s of S-649266 for A. baumannii, P. aeruginosa and S. maltophilia were 2, 1 and 0.5 mg/L, respectively, whereas MIC90s of meropenem were >16 mg/L. S-649266 showed potent in vitro activities against A. baumannii producing carbapenemases such as OXA-type β-lactamases, and P. aeruginosa producing metallo-β-lactamases such as IMP type and VIM type. MIC90 values for these A. baumannii strains and P. aeruginosa strains were 8 and 4 mg/L, respectively.
CONCLUSIONS: S-649266 is a novel antibiotic with potent in vitro activity against a range of non-fermenting Gram-negative bacteria, including MDR strains.
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