Vancomycin-Resistant Enterococci (VRE) in Broiler Flocks 5 Years after the Avoparcin Ban
- 1 June 2002
- journal article
- research article
- Published by Mary Ann Liebert Inc in Microbial Drug Resistance
- Vol. 8 (2), 133-138
- https://doi.org/10.1089/107662902760190680
Abstract
The glycopeptide growth promoter avoparcin was banned from animal production in Denmark in 1995. In this study, we investigated the occurrence of vancomycin-resistant enterococci (VRE) in broiler flocks in the absence of the selective pressure exerted by the use of avoparcin. One hundred sixty-two broiler flocks from rearing systems with different histories of avoparcin exposure were investigated for the presence of VRE. Using a direct selective plating procedure, VRE were isolated from 104 of 140 (74.3%) broiler flocks reared in broiler houses previously exposed to avoparcin on conventional and extensive indoor broiler farms. In contrast, only 2 of 22 (9.1%) organic broiler flocks reared on free-range farms with no history of previous exposure to avoparcin were VRE-positive. Furthermore, the occurrence of VRE over time in flocks reared in broiler houses previously exposed to avoparcin was investigated. Results obtained by direct selective plating showed no significant decrease in the proportion of VRE-positive flocks during the study period (1998–2001). This study demonstrated the extensive occurrence of VRE in broiler flocks more than 5 years after the avoparcin ban in Denmark, and indicates that VRE may persist in the absence of the selective pressure exerted by avoparcin. The results differ markedly from previously published Danish surveillance data on VRE in broilers. This may reflect differences in isolation procedures.Keywords
This publication has 33 references indexed in Scilit:
- Persistence of vancomycin-resistant enterococci (VRE) on Norwegian broiler farmsFEMS Microbiology Letters, 2000
- Antibiotic resistance in bacteria of animal origin: methods in use to monitor resistance in EU countriesInternational Journal of Antimicrobial Agents, 2000
- Glycopeptide Resistance inEnterococcus faeciumfrom Broilers and Pigs Following Discontinued Use of AvoparcinMicrobial Drug Resistance, 1999
- The Use of Avoparcin as a Growth Promoter and the Occurrence of Vancomycin-ResistantEnterococcusSpecies in Norwegian Poultry and Swine ProductionMicrobial Drug Resistance, 1999
- Comparison of Direct and Enrichment Methods for the Selective Isolation of Vancomycin-Resistant Enterococci from Feces of Pigs and PoultryMicrobial Drug Resistance, 1999
- Enterococcus faeciumStrains withvanA-Mediated High-Level Glycopeptide Resistance Isolated from Animal Foodstuffs and Fecal Samples of Humans in the CommunityMicrobial Drug Resistance, 1995
- Evidence for an animal origin of vancomycin-resistant enterococciThe Lancet, 1993
- Cephalosporins as risk factor for nosocomial Enterococcus faecalis bacteremia. A matched case-control studyArchives of Internal Medicine, 1993
- Emergence of Enterococcus as a Significant PathogenClinical Infectious Diseases, 1992
- Estimation in Generalized Linear Models with Random EffectsBiometrika, 1991