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Applied and Environmental Microbiology, December 2002, p. 6220-6236, Vol. 68, No. 12
0099-2240/02/$04.00+0 DOI: 10.1128/AEM.68.12.6220-6236.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.
Molecular Subtype Analyses of Campylobacter spp. from Arkansas and California Poultry Operations
K. L Hiett,1* N. J. Stern,1 P. Fedorka-Cray,2 N. A. Cox,1 M. T. Musgrove,1 and S. Ladely2
Poultry Microbiological Safety Research Unit,1
Antimicrobial Resistance Research Unit, USDA Agricultural Research Service, Athens, Georgia2
Received 22 March 2002/
Accepted 23 August 2002
Campylobacter isolates from diverse samples within broiler production and processing environments were typed by using flaA short variable region DNA sequence analysis. Sixteen flocks from four different farms representing two broiler producers in Arkansas and California were analyzed. Fourteen of the flocks (87.5%) were Campylobacter-positive; two remained negative throughout the 6-week rearing period. In general, multiple clones were present within a flock. Additionally, clones found within a flock were also present on the final product, although the diversity of Campylobacter spp. on the final product appeared to be reduced relative to that observed within the flock. Comparison of clones between flocks on the same farm revealed that some clones of Campylobacter persisted in multiple flocks. Furthermore, some clones were identified across the two farms that were under the same management. In two sampling periods, environmental isolates were positive for Campylobacter prior to flock shedding. Environmental samples associated with five additional flocks were positive for Campylobacter concomitantly with recovery of Campylobacter from the birds. Analysis of the environmental isolates that were positive prior to flock shedding demonstrated that in some instances the environmental isolates possessed genotypes identical to those of isolates originating from the flock, while in other cases the environmental isolates possessed genotypes that were distantly related to isolates obtained from the flock. Analyses of environmental isolates that tested positive concurrently with the positive isolates from the flocks demonstrated varied results; in some instances the environmental isolates possessed genotypes identical to those of isolates originating from the flock, while in other cases the environmental isolates possessed genotypes that were distantly related to isolates obtained from the flock. These data suggest that the external environment may contribute to Campylobacter contamination during poultry production and processing. However, environmental contamination with Campylobacter does not appear to be the sole contributing factor.
* Corresponding author. Mailing address: USDA Agricultural Research Service, Poultry Microbiological Safety Research Unit, Russell Research Center, P.O. Box 5677, Athens, GA 30604-5677. Phone: (706) 546-3593. Fax: (706) 546-3772. E-mail:
khiett{at}saa.ars.usda.gov.
Applied and Environmental Microbiology, December 2002, p. 6220-6236, Vol. 68, No. 12
0099-2240/02/$04.00+0 DOI: 10.1128/AEM.68.12.6220-6236.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.
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