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From 1991 to 1995, 8,975 nonfermentative gram-negative bacilli were isolated from patients at The Ohio State University Medical Center: 71% Pseudomonas aeruginosa, 14% Stenotrophomonas maltophilia, 7.6% Acinetobacter baumannii, and &lt; 2% each of 25 other species. The MICs of trovafloxacin (CP-99,219), ciprofloxacin, ofloxacin, ampicillin-sulbactam, piperacillin, piperacillin-tazobactam, ceftazidime, cefoperazone, ceftriaxone, imipenem, tobramycin, and trimethoprim-sulfamethoxazole (TMP-SMZ) were determined for 308 isolates, representing 13 species, by a standardized broth microdilution method. The activities of all drugs were species dependent. The fluoroquinolones had inconsistent activity against most species, although several relatively uncommon nonfermenters were consistently susceptible or resistant. Trovafloxacin was considerably more active than ciprofloxacin and ofloxacin against S. maltophilia, A. baumannii, and several less common species. Among the beta-lactams, relative activities varied considerably; overall, imipenem had the broadest spectrum of activity but was inactive against S. maltophilia and Burkholderia cepacia isolates. Tobramycin and TMP-SMZ had stereotypic spectra of activity. Tobramycin was active against most species except S. maltophilia, Alcaligenes xylosoxidans subsp. xylosoxidans, Burkholderia spp., and Weeksella virosa. TMP-SMZ was active against most species except P. aeruginosa and Pseudomonas fluorescens-putida. A review of laboratory records indicated few changes in susceptibility patterns from 1991 to 1995; the only clear trend was toward increasing P. aeruginosa resistance to all classes of drugs.

In vitro activities of quinolones, beta-lactams, tobramycin, and trimethoprim-sulfamethoxazole against nonfermentative gram-negative bacilli