Age-related decline in carriage of ampicillin-resistant Escherichia coli in young calves.
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).
Hoyle
Deborah V
DV
Centre for Tropical Veterinary Medicine, Roayl (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush Veterinary Centre, Roslin, Midlothian, United Kingdom. Deborah.Hoyle@ed.ac.uk
Shaw
Darren J
DJ
Knight
Hazel I
HI
Davison
Helen C
HC
Pearce
Michael C
MC
Low
J Chris
JC
Gunn
George J
GJ
Woolhouse
Mark E J
ME
D000375:Aging; D000668:Ampicillin Resistance; D000818:Animals; D002353:Carrier State / Q000382:microbiology / Q000662:veterinary*; D002417:Cattle; D002418:Cattle Diseases / Q000382:microbiology*; D004926:Escherichia coli / Q000187:drug effects / Q000302:isolation & purification*; D004927:Escherichia coli Infections / Q000382:microbiology / Q000662:veterinary; D005243:Feces / Q000382:microbiology*; D010403:Penicillin Resistance