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Journal of Clinical Microbiology, November 2001, p. 4193-4195, Vol. 39, No. 11
0095-1137/01/$04.00+0   DOI: 10.1128/JCM.39.11.4193-4195.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Antimicrobial Growth Promoter Ban and Resistance to Macrolides and Vancomycin in Enterococci from Pigs

P. Boerlin,1,* A. Wissing,1 F. M. Aarestrup,2 J. Frey,1 and J. Nicolet1

Institute for Veterinary Bacteriology, University of Bern, Bern, Switzerland,1 and Danish Veterinary Laboratory, Copenhagen, Denmark2

Received 30 November 2001/Returned for modification 29 March 2001/Accepted 3 September 2001

Ninety-six enterococcus isolates from fecal samples of pigs receiving tylosin as an antimicrobial growth promoter and 59 isolates obtained in the same farms 5 to 6 months after the ban of antimicrobial growth promoters in Switzerland were tested for susceptibility to nine antimicrobial agents. A clear decrease in resistance to macrolides, lincosamides, and tetracycline was visible after the ban. Vancomycin-resistant Enterococcus faecium belonged to the same clonal lineage as vancomycin-resistant isolates previously isolated from Danish pigs.

* Corresponding author. Mailing address: Institute for Veterinary Bacteriology, Länggass-Strasse 122, 3012 Bern, Switzerland. Phone: (41) 31 631 2368. Fax: (41) 31 631 2634. E-mail: patrick.boerlin{at}vbi.unibe.ch.

Journal of Clinical Microbiology, November 2001, p. 4193-4195, Vol. 39, No. 11
0095-1137/01/$04.00+0   DOI: 10.1128/JCM.39.11.4193-4195.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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