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Applied and Environmental Microbiology, October 2006, p. 6632-6637, Vol. 72, No. 10
0099-2240/06/$08.00+0     doi:10.1128/AEM.01038-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.

Genetic and Phenotypic Variability among Salmonella enterica Serovar Typhimurium Isolates from California Dairy Cattle and Humans

J. M. Adaska,1* A. J. Silva,1,{dagger} A. C. B. Berge,2 and W. M. Sischo2

California Animal Health and Food Safety Laboratory,1 Veterinary Medical Teaching and Research Center, University of California, Davis, School of Veterinary Medicine, Tulare, California2

Received 4 May 2006/ Accepted 23 July 2006

Fifty-six human and 24 adult dairy cattle isolates of Salmonella enterica serovar Typhimurium from a single county in California were compared using ribotyping, insertion sequence typing (IS200), pulsed-field gel electrophoresis, plasmid typing, phage typing, and antimicrobial resistance testing. The majority of the isolates fell into one of two groups which were phage types DT104 and DT193. Combining the information from all typing methods, a total of 45 different "clusters" were defined, with 35 of those including only a single isolate. The library of isolates had a high degree of variability, but antibiotic resistance and plasmid typing each defined single clusters in which human or bovine isolates predominated ({chi}2, P < 0.05).

* Corresponding author. Mailing address: California Animal Health and Food Safety Laboratory, Tulare Branch, 18830 Road 112, Tulare, CA 93274. Phone: (559) 688-7543. Fax: (559) 686-4231. E-mail: jmadaska{at}ucdavis.edu.

{dagger} Present address: Department of Microbiology, Biochemistry, and Immunology, Morehouse School of Medicine, 720 Westview Dr., SW, Atlanta, GA 30310-1495.

Applied and Environmental Microbiology, October 2006, p. 6632-6637, Vol. 72, No. 10
0099-2240/06/$08.00+0     doi:10.1128/AEM.01038-06
Copyright © 2006, American Society for Microbiology. All Rights Reserved.





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Copyright © 2006 by the American Society for Microbiology. All rights reserved.