Abstract
The new aryl fluoroquinolones, Abbott 56619 and Abbott 56620, were compared to ciprofloxacin, norfloxacin and newer β-lactam agents in standardized microliter testing versus multidrug-resistant gram-negative bacilli. Ciprofloxacin, followed by Abbott 56620, was generally the most active quinolone and imipenem the most active β-lactam agent.

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