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  • Title: Antimicrobial susceptibility of 3931 organisms isolated from intensive care units in Canada: Canadian National Intensive Care Unit Study, 2005/2006.
    Author: Zhanel GG, DeCorby M, Nichol KA, Wierzbowski A, Baudry PJ, Karlowsky JA, Lagacé-Wiens P, Walkty A, Mulvey MR, Hoban DJ, Canadian Antimicrobial Resistance Alliance.
    Journal: Diagn Microbiol Infect Dis; 2008 Sep; 62(1):67-80. PubMed ID: 18513913.
    Abstract:
    We tested the in vitro activity of 15 antimicrobials against Gram-positive cocci and 12 antimicrobials against Gram-negative bacilli versus 3931 isolates (20 most common organisms) obtained between September 1, 2005, and June 30, 2006, from 19 intensive care units (ICUs) across Canada. The most active (based upon MIC only) agents against methicillin-resistant Staphylococcus aureus and methicillin-resistant Staphylococcus epidermidis were dalbavancin, daptomycin, linezolid, tigecycline, and vancomycin with MIC(90) (microg/mL) of 0.06 and < or =0.03, 0.25 and 0.12, 2 and 1, 0.5 and 0.5, and 1 and 2, respectively. The most active agents against vancomycin-resistant enterococci were daptomycin, linezolid, and tigecycline with MIC(90) (microg/mL) of 1, 4, and 0.12, respectively. The most active agents against Escherichia coli were amikacin, cefepime, meropenem, piperacillin/tazobactam, and tigecycline with MIC(90) (microg/mL) of 4, < or =1, < or =0.12, 8, and 0.5, respectively. The most active agents against extended-spectrum beta-lactamase-producing E. coli were meropenem and tigecycline with MIC(90) (microg/mL) of < or =0.12 and 1, respectively. The most active agents against Pseudomonas aeruginosa were amikacin, cefepime, meropenem, and piperacillin/tazobactam with MIC(90) (microg/mL) of 16, 32, 16, and 64, respectively. The most active agents against Stenotrophomonas maltophilia were tigecycline and trimethoprim/sulfamethoxazole with MIC(90) (microg/mL) of 4 and 4, respectively. The most active agents against Acinetobacter baumannii were fluoroquinolones (e.g., levofloxacin), meropenem, and tigecycline with MIC(90) (microg/mL) of 0.5, 1, and 2, respectively. In conclusion, the most active agents versus Gram-positive cocci and Gram-negative bacilli obtained from Canadian ICUs were daptomycin, linezolid, tigecycline, dalbavancin and amikacin, cefepime, meropenem, piperacillin/tazobactam, and tigecycline (not P. aeruginosa), respectively.
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