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Antimicrobial Agents and Chemotherapy, October 2000, p. 2777-2783, Vol. 44, No. 10
University of Iowa College of
Medicine1 and The Veterans Affairs
Medical Center,2 Iowa City, and Iowa
State College of Veterinary Medicine, Ames,3
Iowa
Received 18 February 2000/Returned for modification 21 June
2000/Accepted 25 July 2000
Salmonella spp. are important food-borne pathogens that
are demonstrating increasing antimicrobial resistance rates in isolates obtained from food animals and humans. In this study, 10 multidrug-resistant, cephalosporin-resistant Salmonella
isolates from bovine, porcine, and human sources from a single
geographic region were identified. All isolates demonstrated resistance
to cephamycins and extended-spectrum cephalosporins as well as
tetracycline, chloramphenicol, streptomycin, and sulfisoxazole.
Molecular epidemiological analyses revealed eight distinct chromosomal
DNA patterns, suggesting that clonal spread could not entirely explain
the distribution of this antimicrobial resistance phenotype. However,
all isolates encoded an AmpC-like
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Copyright © 2000, American Society for Microbiology. All rights reserved.
Animal and Human Multidrug-Resistant, Cephalosporin-Resistant
Salmonella Isolates Expressing a Plasmid-Mediated CMY-2
AmpC
-Lactamase
-lactamase, CMY-2. Eight isolates
contained a large nonconjugative plasmid that could transform
Escherichia coli. Transformants coexpressed cephalosporin,
tetracycline, chloramphenicol, streptomycin, and sulfisoxazole
resistances. Plasmid DNA revealed highly related restriction fragments
though plasmids appeared to have undergone some evolution over time.
Multidrug-resistant, cephalosporin-resistant Salmonella
spp. present significant therapeutic problems in animal and human
health care and raise further questions about the association between
antimicrobial resistance, antibiotic use in animals, and transfer of
multidrug-resistant Salmonella spp. between animals and man.
*
Corresponding author. Mailing address: SW34 GH, 200 Hawkins Dr., Iowa City, IA 52242. Phone: (319) 356-3909. Fax: (319)
345-4600. E-mail: patricia-winokur{at}uiowa.edu.
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