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Diagn Microbiol Infect Dis. 2011 Mar;69(3):291-306. doi: 10.1016/j.diagmicrobio.2010.10.025.

Antimicrobial susceptibility of 15,644 pathogens from Canadian hospitals: results of the CANWARD 2007-2009 study.

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1
Department of Medical Microbiology and Infectious Diseases, University of Manitoba, Winnipeg, Manitoba, Canada R3E 0J9. ggzhanel@pcs.mb.ca

Abstract

The CANWARD study (Canadian Ward Surveillance Study) assessed the antimicrobial susceptibility of a variety of available agents against 15 644 pathogens isolated from patients in Canadian hospitals between 2007 and 2009. The most active (based on MIC data) agents against methicillin-resistant Staphylococcus aureus (MRSA) and vancomycin-resistant enterococci were daptomycin, linezolid, tigecycline, and vancomycin (MRSA only) with MIC(90)'s (μg/mL) of 0.25 and 2, 2 and 2, 0.5 and 0.12, and 1, respectively. The most active agents against extended-spectrum β-lactamase-producing Escherichia coli were colistin (polymyxin E), doripenem, ertapenem, meropenem, and tigecycline with MIC(90)'s (μg/mL) of 1, ≤ 0.12, 0.25, ≤ 0.12, and 1, respectively. The most active agents against Pseudomonas aeruginosa were amikacin, cefepime, ceftazidime, colistin, doripenem, meropenem, and piperacillin-tazobactam with MIC(90)'s (μg/mL) of 32, 16, 32, 2, 4, 8, and 64, respectively. Overall, the most active agents versus Gram-positive cocci from Canadian hospitals were vancomycin, linezolid, daptomycin, and tigecycline and versus Gram-negative bacilli were amikacin, cefepime, doripenem, ertapenem (excluding Pseudomonas aeruginosa), meropenem, piperacillin-tazobactam, and tigecycline (excluding Pseudomonas aeruginosa).

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