Abstract
The in vitro activity of sparfloxacin (CI-978, AT-4140), a new quinolone which is active against gram-negative and gram-positive bacteria, and nine other broad-spectrum antibiotics was tested against 128 gram-negative nosocomial bloodstream isolates from separate patients. Sparfloxacin and ciprofloxacin were among the most potent antibiotics against Escherichia coli (n = 40), Enterobacter cloacae (n = 18), Klebsiella oxytoca (n = 13), and Klebsiella pneumoniae (n = 19), with MIC90 values of less than or equal to 0.25 microgram/ml. Ciprofloxacin was slightly more potent than sparfloxacin against Serratia marcescens (n = 14), the MIC90 values being 0.25 and 1.0 micrograms/ml respectively, although all strains were susceptible to both agents. Sparfloxacin was slightly less potent than ciprofloxacin against Pseudomonas aeruginosa (n = 24), the MIC90 values being 4.0 and 0.5 micrograms/ml respectively. Overall, the in vitro activity of sparfloxacin compared favorably with that of ciprofloxacin and the other broad spectrum agents tested against nosocomial gram-negative bloodstream isolates.
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