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Volume 13, Number 3—March 2007


Population-based Laboratory Surveillance for AmpC β-Lactamase–producing Escherichia coli, Calgary

Johann D.D. Pitout*Comments to Author , Daniel B. Gregson*, Deirdre L. Church*, and Kevin B. Laupland*
Author affiliations: *University of Calgary, Calgary, Alberta, Canada;

Main Article


Features of Escherichia coli β-lactamases isolated from Calgary Health Region, 2000–2003

Feature*CMY types (n = 125), no. (%)Non-CMY types (n = 244), no. (%)p value
Female105 (84)205 (84)1.0
Community-onset104 (83)204 (84)1.0
Resistant to
  Ciprofloxacin10 (8)23 (9)0.6
  Gentamicin28 (22)26 (11)0.004
  Tobramycin13 (10)19 (8)0.4
  Trimethoprim-sulfamethoxazole29 (23)44 (18)0.3

*Median age for those with CMY types was 54.3 (interquartile range 27.7–76.1); median age for those with non-CMY types was 50.5 (interquartile range 26.6–73.3).

Main Article

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