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The in vitro activity of trovafloxacin (CP-99,219), a new fluoroquinolone, was compared with the in vitro activities of other commonly used quinolones and other antimicrobial agents against 445 gram-positive microorganisms isolated between 1986 and 1995 from patients with endocarditis and those with other bloodstream infections. The MICs at which 90% of the isolates are inhibited (MIC90) of trovafloxacin for methicillin-susceptible staphylococci, viridans group streptococci, and enterococci were 0.06, 0.25, and 0.5 mg/liter, respectively. The MIC90 of trovafloxacin for vancomycin-resistant enterococci as well as for methicillin-resistant Staphylococcus aureus and methicillin-susceptible and ciprofloxacin-resistant S. aureus, isolated from sources other than blood, was 1 mg/liter. For the quinolones the rank order of activity was trovafloxacin &gt; sparfloxacin &gt; ciprofloxacin = ofloxacin &gt; pefloxacin. Depending on the species tested, trovafloxacin was 4- to 64-fold more active than ciprofloxacin. Further experimental and in vivo studies are warranted to evaluate the efficacy of trovafloxacin in the treatment of bacterial endocarditis and other infections caused by gram-positive organisms.

antimicrobial agents and chemotherapy

Comparative in vitro activities of trovafloxacin (CP-99,219) against 445 gram-positive isolates from patients with endocarditis and those with other bloodstream infections