Emerging Infectious Disease ISSN: 1080-6059

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

Johann D.D. Pitout*

, Daniel B. Gregson*, Deirdre L. Church*, and Kevin B. Laupland*

Author affiliations: *University of Calgary, Calgary, Alberta, Canada;

Figure 1

AmpC β-lactamase–producing Escherichia coli isolates per 1,000 E. coli isolates, Calgary Health Region, 2000–2003. Data are averaged over the 4-year period. The presence of plasmid-mediated AmpC β-lactamase genes was determined using multiplex PCR conditions and primers as described [8]. CMY; isolates positive for chromosomal gene of Citrobacter freundii; non-CMY; isolates negative by multiplex PCR.

Figure 1. AmpC β-lactamase–producing Escherichia coli isolates per 1,000 E. coli isolates, Calgary Health Region, 2000–2003. Data are averaged over the 4-year period. The presence of plasmid-mediated AmpC β-lactamase genes was determined using multiplex PCR conditions and primers as described [8]. CMY; isolates positive for chromosomal gene of Citrobacter freundii; non-CMY; isolates negative by multiplex PCR.

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