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Relations between the consumption of antimicrobial growth promoters and the occurrence of resistance among Enterococcus faecium isolated from broilers

Published online by Cambridge University Press:  27 January 2004

H.-D. EMBORG ,
J. S. ANDERSEN ,
A. M. SEYFARTH  and
H. C. WEGENER
H.-D. EMBORG
Affiliation:
Danish Veterinary Institute, Bülowsvej 27, DK-1790 Copenhagen V, Denmark Department of Animal Science and Animal Health, The Royal Veterinary and Agricultural University, Grønnegårdsvej 8, DK-1870 Frederiksberg C, Denmark
J. S. ANDERSEN
Affiliation:
Danish Veterinary Institute, Bülowsvej 27, DK-1790 Copenhagen V, Denmark
A. M. SEYFARTH
Affiliation:
Danish Veterinary Institute, Bülowsvej 27, DK-1790 Copenhagen V, Denmark
H. C. WEGENER
Affiliation:
Danish Veterinary Institute, Bülowsvej 27, DK-1790 Copenhagen V, Denmark
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Abstract

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The present study investigates, at farm level, the effect of the time-span between sampling and the last time a particular antimicrobial growth promoter (AGP) was included in the feed on the probability of selecting an AGP-resistant Enterococcus faecium isolate from a broiler flock. The probability that a randomly selected E. faecium isolate was resistant to avilamycin, erythromycin or virginiamycin was 0·91, 0·92 and 0·84, respectively if the isolate originated from a broiler flock fed either avilamycin- or virginiamycin-supplemented feed. As the time-span between sampling and the last AGP consumption increased, the probability of isolating an E. faecium isolate resistant to a particular AGP decreased (probability <0·2 within 3–5 years after last exposure to AGPs). The decrease in probability over time showed little farm-to-farm variation. The number of times a particular AGP was given to previous flocks reared in the same house had no effect on the probability of isolating a resistant isolate.

Type
Research Article
Information
Epidemiology & Infection , Volume 132 , Issue 1 , February 2004 , pp. 95 - 105
Copyright
© 2004 Cambridge University Press