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Applied and Environmental Microbiology, November 2004, p. 6927-6930, Vol. 70, No. 11
0099-2240/04/$08.00+0     DOI: 10.1128/AEM.70.11.6927-6930.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

SHORT REPORT

Age-Related Decline in Carriage of Ampicillin-Resistant Escherichia coli in Young Calves

Deborah V. Hoyle,^1,2* Darren J. Shaw,¹ Hazel I. Knight,^1,3 Helen C. Davison,⁴ Michael C. Pearce,^1,3 J. Chris Low,⁵ George J. Gunn,³ and Mark E. J. Woolhouse¹

Centre for Tropical Veterinary Medicine, Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush Veterinary Centre, Roslin, Midlothian,¹ Department of Medical Microbiology, Medical School, University of Edinburgh, Edinburgh,² Epidemiology Unit, Scottish Agricultural College, Drummondhill, Inverness,³ Centre for Epidemiology and Risk Analysis, Veterinary Laboratories Agency, Weybridge, New Haw, Addlestone, Surrey,⁴ Scottish Agricultural College, Bush Estate, Penicuik, Midlothian, United Kingdom⁵

Received 26 April 2004/ Accepted 29 June 2004

ABSTRACT

The presence of ampicillin-resistant Escherichia coli (Amp^r E. coli) in the fecal flora of calves was monitored on a monthly basis in seven cohorts of calves. Calves were rapidly colonized by Amp^r E. coli, with peak prevalence in cohort calves observed in the 4 months after the calves were born. The prevalence of calves yielding Amp^r E. coli in cohorts consistently declined to low levels with increasing age of the calves (P < 0.001).

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* Corresponding author. Mailing address: Department of Medical Microbiology, Medical School, University of Edinburgh, Teviot Place, Edinburgh EH8 9AG, United Kingdom. Phone: 44 (0) 131 650 4523. Fax: 44 (0) 131 651 1385. E-mail: Deborah.Hoyle{at}ed.ac.uk.

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Applied and Environmental Microbiology, November 2004, p. 6927-6930, Vol. 70, No. 11
0099-2240/04/$08.00+0     DOI: 10.1128/AEM.70.11.6927-6930.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

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