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

Pitout, Johann D.D.; Gregson, Daniel B.; Church, Deirdre L.; Laupland, Kevin B.

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

Published Date:

Mar 2007

Source:

Emerg Infect Dis. 13(3):443-448.

[PDF-215.34 KB]

Details:

Personal Authors:

Pitout, Johann D.D. ; Gregson, Daniel B. ; Church, Deirdre L. ; Laupland, Kevin B. ;

Keywords:

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Description:

In the Calgary Health Region during 2000-2003, prospective, active, population-based laboratory surveillance for all cefoxitin-resistant Escherichia coli isolates was performed. Isolates were screened with an inhibitor-based disk test, and plasmid-mediated types were identified by multiplex PCR with sequencing. A total of 369 AmpC beta-lactamase-producing E. coli isolates were identified; annual incidence rates were 1.7, 4.3, 11.2, and 15 per 100,000 residents for each year, respectively. AmpC beta-lactamase-producing E. coli was 5x more likely to be isolated from female than male patients across all age groups except < 1 year. Of these isolates, 83% were community onset, and urine was the principal site of isolation (90% of patients). PCR showed that 125 (34%) were positive for bla(cmy) genes; sequencing identified these enzymes to be CMY-2. In this large Canadian region, AmpC beta-lactamase-producing E. coli is an emerging community pathogen that commonly causes urinary tract infections in older women.

Document Type:

Journal Article

Collection(s):

Emerging Infectious Diseases

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