Journal Article

Possible Animal Origin of Human-Associated, Multidrug-Resistant, Uropathogenic <i>Escherichia coli</i>

Meena Ramchandani, Amee R. Manges, Chitrita DebRoy, Sherry P. Smith, James R. Johnson and Lee W. Riley

in Clinical Infectious Diseases

Published on behalf of Infectious Diseases Society of America

Volume 40, issue 2, pages 251-257
Published in print January 2005 | ISSN: 1058-4838
Published online January 2005 | e-ISSN: 1537-6591 | DOI:
Possible Animal Origin of Human-Associated, Multidrug-Resistant, Uropathogenic Escherichia coli

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Background. The multistate occurrence of cases of urinary tract infection (UTI) caused by trimethoprim-sulfamethoxazole (TMP-SMZ)—resistant Escherichia coli strains belonging to a single clonal group (designated as clonal group A [CgA]) in the United States has raised an intriguing hypothesis that these infections may have been spread by contaminated food products. The present study attempted to determine if CgA strains could be traced to food animals.

Methods. A total of 495 animal and environmental E. coli isolates, which belonged to serogroups O11, O17, O73, and O77 and were collected between 1965 and 2002 by the Gastroenteric Disease Center at Pennsylvania State University (University Park, PA), were further subtyped by antimicrobial drug susceptibility, enterobacterial repetitive intergenic consensus (ERIC2) PCR, random amplified polymorphic DNA analysis, pulsed-field gel electrophoresis (PFGE), and virulence profile pattern.

Results. Of 495 isolates, 128 (26%) had an ERIC2 PCR electrophoretic pattern indistinguishable from that of the human prototype CgA strain, and 14 CgA isolates were resistant to TMP-SMZ. Cluster analysis of PFGE patterns showed that 1 of these 14 isolates, obtained from a cow in 1988, was 94% similar to a CgA uropathogenic human-associated E. coli strain. The pattern for this isolate was included among a cluster of PFGE patterns for 5 human-associated UTI isolates that were >80% similar to each other.

Conclusions. These observations suggest that drug-resistant, uropathogenic human-associated E. coli strains potentially have an animal origin. The possibility that human drug-resistant UTI could be a foodborne illness has serious public health implications.

Journal Article.  3794 words.  Illustrated.

Subjects: Infectious Diseases ; Immunology ; Public Health and Epidemiology ; Microbiology

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