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Journal of Clinical Microbiology, February 2005, p. 898-902, Vol. 43, No. 2
0095-1137/05/$08.00+0     doi:10.1128/JCM.43.2.898-902.2005

Persistence of Escherichia coli O157 Isolates on Bovine Farms in England and Wales

Ernesto Liebana,1* Richard P. Smith,2 Miranda Batchelor,1 Ian McLaren,1 Claire Cassar,1 Felicity A. Clifton-Hadley,1 and Giles A. Paiba2

Department of Food and Environmental Safety,1 Center of Epidemiology and Risk Analysis, Veterinary Laboratories Agency—Weybridge, Addlestone, Surrey, United Kingdom2

Received 24 February 2004/ Returned for modification 25 August 2004/ Accepted 10 September 2004

We performed pulsed-field gel electrophoresis on Escherichia coli O157 isolates (n = 318) from 199 healthy animals in a longitudinal study carried out on nine farms. Investigation of the restriction types proved that at the farm level, the same clones can be detected on sampling occasions separated by as much as 17 months. The cohort animals were repeatedly sampled, and for some of these, the same clones were obtained on sampling occasions separated by as much as 8 months.

* Corresponding author. Mailing address: Veterinary Laboratories Agency—Weybridge, Department of Food and Environmental Safety, Woodham Lane, Addlestone, KT15 3NB Surrey, United Kingdom. Phone: 44 1932 357587. Fax: 44 1932 357595. E-mail: E.liebana{at}VLA.DEFRA.gsi.gov.UK.

Journal of Clinical Microbiology, February 2005, p. 898-902, Vol. 43, No. 2
0095-1137/05/$08.00+0     doi:10.1128/JCM.43.2.898-902.2005




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