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Applied and Environmental Microbiology, January 2001, p. 445-448, Vol. 67, No. 1
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.1.445-448.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Relative Distribution and Conservation of Genes Encoding Aminoglycoside-Modifying Enzymes in Salmonella enterica Serotype Typhimurium Phage Type DT104

Timothy S. Frana,1 Steve A. Carlson,2,* and Ronald W. Griffith1

Department of Veterinary Microbiology and Preventive Medicine, Iowa State University College of Veterinary Medicine, Ames, Iowa 50011,1 and Preharvest Food Safety and Enteric Disease Research Unit, National Animal Disease Center, USDA Agricultural Research Service, Ames, Iowa 500102

Received 22 June 2000/Accepted 29 September 2000

PCR was used to identify genes encoding aminoglycoside-modifying enzymes in 422 veterinary isolates of Salmonella enterica serotype Typhimurium. The identities of extra-integron genes encoding resistance to streptomycin, gentamicin, kanamycin, and apramycin were evaluated. Gentamicin resistance was conferred by the aadB gene. Kanamycin resistance was encoded by either the aphA1-Iab gene or the Kn gene. Apramycin resistance was determined by the aacC4 gene. Analysis of gene distribution did not reveal significant differences with regard to phage type, host species, or region except for the Kn gene, which was found mostly in nonclinical isolates. The data from this study indicate that pentaresistant DT104 does not acquire extra-integron genes in species- or geography-related foci, which supports the hypothesis that clonal expansion is the method of spread of this organism.

* Corresponding author. Mailing address: USDA-ARS National Animal Disease Center, 2300 Dayton Rd., Box 70, Ames, IA 50010. Phone: (515) 663-7612. Fax: (515) 663-7458. E-mail: scarlson{at}nadc.ars.usda.gov.

Applied and Environmental Microbiology, January 2001, p. 445-448, Vol. 67, No. 1
0099-2240/01/$04.00+0   DOI: 10.1128/AEM.67.1.445-448.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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