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 . CMY; isolates positive for chromosomal gene of Citrobacter freundii; non-CMY; isolates negative by multiplex PCR.
The opinions expressed by authors contributing to this journal do not necessarily reflect the opinions of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.