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Antimicrobial Agents and Chemotherapy, May 2001, p. 1374-1378, Vol. 45, No. 5
0066-4804/01/$04.00+0   DOI: 10.1128/AAC.45.5.1374-1378.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Differences in Antibiotic Resistance Patterns of Enterococcus faecalis and Enterococcus faecium Strains Isolated from Farm and Pet Animals

Patrick Butaye,* Luc A. Devriese, and Freddy Haesebrouck

Laboratory of Veterinary Bacteriology and Mycology, Department of Pathology, Bacteriology, and Poultry Diseases, Faculty of Veterinary Medicine, University of Ghent, B-9820 Merelbeke, Belgium

Received 14 June 2000/Returned for modification 28 September 2000/Accepted 7 February 2001

The prevalence of acquired resistance in 146 Enterococcus faecium and 166 Enterococcus faecalis strains from farm and pet animals, isolated in 1998 and 1999 in Belgium, against antibiotics used for growth promotion and for therapy was determined. Acquired resistance against flavomycin and monensin, two antibiotics used solely for growth promotion, was not detected. Avoparcin (glycopeptide) resistance was found sporadically in E. faecium only. Avilamycin resistance was almost exclusively seen in strains from farm animals. Resistance rates were higher in E. faecium strains from broiler chickens than in strains from other animal groups with tylosin and virginiamycin and in E. faecalis as well as in E. faecium strains with narasin and bacitracin. Resistance against ampicillin was mainly found among E. faecium strains from pets and was absent in E. faecalis. Tetracycline resistance occurred most often in strains from farm animals, while enrofloxacin resistance, only found in E. faecalis, occurred equally among strains from all origins. Resistance against gentamicin was very rare in broiler strains, whereas resistance rates were high in strains from other origins. It can be concluded that resistance against antibiotics used solely for growth promotion was more prevalent in E. faecium strains than in E. faecalis strains. With few exceptions, resistance against the different categories of antibiotics was more prevalent in strains from farm animals than in those from pets.

* Corresponding author. Present address: CODA-CERVA-VAR, Groeselenberg 99, 1180 Brussels, Belgium. Phone: 32 2 379 04 28. Fax: 32 2 379 06 70. E-mail: pabut{at}var.fgov.be.

Antimicrobial Agents and Chemotherapy, May 2001, p. 1374-1378, Vol. 45, No. 5
0066-4804/01/$04.00+0   DOI: 10.1128/AAC.45.5.1374-1378.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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