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Journal of Clinical Microbiology, July 2000, p. 2774-2777, Vol. 38, No. 7
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Characterization of Glycopeptide-Resistant Enterococcus faecium (GRE) from Broilers and Pigs in Denmark: Genetic Evidence that Persistence of GRE in Pig Herds Is Associated with Coselection by Resistance to Macrolides

Frank Møller Aarestrup*

Danish Veterinary Laboratory, DK-1790 Copenhagen, Denmark

Received 24 November 1999/Returned for modification 7 February 2000/Accepted 25 March 2000

Glycopeptide-resistant enterococci (GRE) from broilers and pigs were characterized to investigate the background for the persistence of GRE in pig herds. All porcine isolates belonged to closely related pulsed-field gel electrophoretic (PFGE) types, with the ermB and vanA genes located on the same transferable genetic element. Broiler isolates belonged to different PFGE types. The persistence of GRE in Danish pig herds after the ban of glycopeptides may be explained by the genetic link between ermB and vanA and coselection by use of macrolides for treatment and growth promotion.

* Mailing address: Danish Veterinary Laboratory, Bülowsvej 27, DK-1790 Copenhagen, Denmark. Phone: 45 35 30 01 00. Fax: 45 35 30 01 20. E-mail: faa{at}svs.dk.

Journal of Clinical Microbiology, July 2000, p. 2774-2777, Vol. 38, No. 7
0095-1137/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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