In vitro activities of tigecycline, ertapenem, isepamicin, and other antimicrobial agents against clinically isolated organisms in Taiwan

Nai Cheng Cheng, Po Ren Hsueh, Yung Ching Liu, Jainn Ming Shyr, Wen Kuei Huang, Lee Jene Teng, Cheng Yi Liu

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This study evaluated the in vitro activities of tigecycline, ertapenem, isepamicin, and other comparators against 861 bacterial isolates recovered from patients treated in three major teaching hospitals in 2003. MICs to antimicrobial agents were determined by the agar dilution method. High rates of oxacillin resistance (58%) in Staphylococcus aureus (60 isolates), and vancomycin resistance (21%) and quinupristin-dalfopristin nonsusceptibility (39%) in Enterococcus faecium (34 isolates) were found. Carbapenems had excellent in vitro activities (≥98% susceptibility) against the 419 isolates of Enterobacteriaceae, with the MIC 50 and MIC 90 of imipenem, meropenem, and ertapenem being 0.25 and 4 mg/L, 0.03 and 0.12 mg/L, and 0.03 and 0.5 mg/L, respectively. For, Pseudomonas aeruginosa (74 isolates) and Burkholderia cepacia (21 isolates), meropenem (MIC 90, 0.25, 2, and 4 mg/L, respectively) had better in vitro activities than imipenem (MIC 90, 8, 4, and 32 mg/L, respectively) and ertapenem (MIC 90, 0.5, > 32, and 32 mg/L, respectively). Isepamicin had a similar activity with amikacin against all Enterobacteriaceae, Pseudomonas aeruginosa, B. cepacia, and Acinetobacter baumannii, except for C. freundii isolates in which isepamicin had an eight-fold activity better than amikacin. Tigecycline had excellent in vitro activities against all isolates tested (MIC 90, ≤1 mg/L) including 14 pandrug-resistant A. baumannii isolates (MICs, 1-4 mg/L), except for Proteus mirabilis (59 isolates; MIC 90, 8 mg/L), Bacteroides fragilis (60 isolates; MIC 90, 8 mg/L), P. aeruginosa (MIC 90,16 mg/L), and B. cepacia (21 isolates; MIC 90, 16 mg/L). Tigecycline, carbapenems, and isepamicin exhibited better or comparable in vitro activities against a wide spectrum of commonly encountered bacteria than other comparator antimicrobials and may represent therapeutic options for infections due to multidrug-resistant pathogens.

Original languageEnglish
Pages (from-to)330-341
Number of pages12
JournalMicrobial Drug Resistance
Issue number4
Publication statusPublished - Dec 2005
Externally publishedYes


ASJC Scopus subject areas

  • Microbiology (medical)
  • Pharmacology
  • Immunology
  • Microbiology

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