The in vitro susceptibilities of 12 strains of Chlamydia pneumonia to a new quinolone, OPC-17116; ofloxacin; and sparfloxacin were determined. OPC-17116 was slightly less active than sparfloxacin but more active than ofloxacin, with a MIC for 90% of strains tested and a minimal chlamydiacidal concentration for 90% of strains tested of 0.5 micrograms/ml.
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