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Applied and Environmental Microbiology, October 2005, p. 5752-5758, Vol. 71, No. 10
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.10.5752-5758.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Increasing Prevalence of Campylobacter jejuni in Feedlot Cattle through the Feeding Period

Thomas E. Besser,1* Jeffrey T. LeJeune,2 Daniel H. Rice,3 Janice Berg,4 R. P. Stilborn,4 Katherine Kaya,1 Wonki Bae,1,5 and Dale D. Hancock6

Department of Veterinary Microbiology and Pathology, College of Veterinary Medicine, Washington State University, Pullman, Washington 99164,1 Food Animal Health Research Program, OARDC, The Ohio State University, Wooster, Ohio 44691,2 Food Laboratory Division, New York State Department of Agriculture and Markets, Albany, New York 12235,3 Lakeside Research, Lakeside Feeders, Ltd., Brooks, Alberta T1R 1B7, Canada,4 Department of Microbiology, College of Veterinary Medicine and School of Agricultural Biotechnology, Seoul National University, Seoul 151-742, Republic of Korea,5 Field Disease Investigation Unit, Department of Veterinary Clinical Sciences, College of Veterinary Medicine, Washington State University, Pullman, Washington 991646

Received 7 February 2005/ Accepted 28 April 2005

The prevalence of Campylobacter jejuni in commercial feedlot cattle was monitored throughout the feeding period by repeated bacteriologic culture of feces. Fecal pats (n = 10) in 20 feedlot pens were sampled at 2-weeks interval beginning at entry into the feedlot and continuing until slaughter. The least-squares mean C. jejuni prevalence increased from 1.6% at the first sampling to 61.3% at the final sampling just prior to slaughter. Diverse C. jejuni pulsed-field gel electrophoresis macrorestriction profiles (MRP) were identified among the cattle isolates, but five prevalent MRP and minor variants accounted for >80% of all typed isolates. Chlorination of the water supplied to the water troughs of half of the pens did not affect C. jejuni prevalence in the cattle. Overall, the least-squares mean C. jejuni prevalences were 45.6 and 43.6% in chlorinated and nonchlorinated feedlot pens, respectively. The results of this study demonstrate apparent transmission of C. jejuni among feedlot cattle during the feeding period, unaffected by water chlorination, resulting in a high prevalence of C. jejuni excretion by cattle approaching slaughter.

* Corresponding author. Mailing address: Department of Veterinary Microbiology and Pathology, College of Veterinary Medicine, Washington State University, Pullman, WA 99164. Phone: (509) 335-6075. Fax: (509) 335-8529. E-mail: tbesser{at}vetmed.wsu.edu.

Applied and Environmental Microbiology, October 2005, p. 5752-5758, Vol. 71, No. 10
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.10.5752-5758.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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