Journal Article
Research Support, Non-U.S. Gov't
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Antimicrobial activity of doripenem (S-4661): a global surveillance report (2003).

The spectrum of activity and potency of doripenem, a broad-spectrum parenteral carbapenem currently in clinical development, was evaluated using 16 008 clinical bacterial isolates collected as part of an international surveillance project during 2003. Using reference broth microdilution methods, doripenem was found to be highly active against oxacillin-susceptible Staphylococcus aureus and coagulase-negative staphylococci (2705 and 297 isolates, respectively; MIC90s 0.06 mg/L), with a potency greater than that of other carbapenem antibiotics. Against enterococci (1474 isolates), with the exception of Enterococcus faecium, doripenem displayed modest activity (MIC50 4). Doripenem was among the most potent agents tested against Streptococcus pneumoniae, viridans group streptococci and beta-haemolytic streptococci (885, 140 and 397 isolates; MIC(90)s 0.5, 0.5 and 0.03 mg/L, respectively). For Enterobacteriaceae (> 6200 isolates), doripenem was four- to 32-fold more active than imipenem against wild-type isolates (MIC90s 0.03-0.5 mg/L). MIC90s for confirmed extended-spectrum beta-lactamase-producing Escherichia coli and Klebsiella pneumoniae (121 and 155 isolates; 0.06 and 0.12 mg/L, respectively) were two-fold higher than for wild-type isolates. Doripenem was also active against Citrobacter spp., Enterobacter spp. and Serratia spp. (MIC90s 0.06-0.25 mg/L), including ceftazidime-resistant isolates. Doripenem and meropenem were the most active agents among all beta-lactams against Pseudomonas aeruginosa (829 isolates; MIC50/90s 0.5/8 and 0.5/16 mg/L, respectively), whereas doripenem and imipenem were the most active agents against Acinetobacter spp. (155 isolates; MIC50/90s 0.5/4 and

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