Age-related decline in carriage of ampicillin-resistant Escherichia coli in young calves

Deborah Hoyle, Darren J Shaw, Hazel I Knight, Helen C Davison, Michael C Pearce, Christopher Low, George J Gunn, Mark E J Woolhouse

Research output: Contribution to journalArticlepeer-review


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).
Original languageEnglish
Pages (from-to)6927-30
Number of pages4
JournalApplied and Environmental Microbiology
Issue number11
Publication statusPublished - Sep 2004


  • Aging
  • Ampicillin Resistance
  • Animals
  • Carrier State/microbiology
  • Carrier State/veterinary
  • Cattle
  • Cattle Diseases/microbiology
  • Escherichia coli/drug effects
  • Escherichia coli/isolation & purification
  • Escherichia coli Infections/microbiology
  • Escherichia coli Infections/veterinary
  • Feces/microbiology
  • Penicillin Resistance


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