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The in vitro antimicrobial activity of the three most commonly used fluoroquinolones (norfloxacin, ofloxacin and ciprofloxacin) was measured for 2235 isolates of seven common pathogenic gram-negative bacteria. Collected from a major teaching hospital in Taiwan during the years 1985-86, 1989-90, and 1996-97, the samples were evaluated using the agar dilution method. The overall susceptibility to fluoroquinolones...
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