Abstract:
:Avoparcin, a vancomycin analogue, was banned as a feed additive in Taiwan in 2000. A nationwide surveillance was conducted to study the prevalence of vancomycin-resistant enterococci (VRE) on chicken farms between 2000 and 2003. Among the 1021 E. faecalis and 967 E. faecium isolates studied, resistance to tetracycline, erythromycin, high-level aminoglycosides, ciprofloxacin and chloramphenicol either increased or remained high except vancomycin. The proportion of VRE decreased, between 2000 and 2003, from 13.7% (22/161) to 3.7% (11/299) for E. faecalis, and 3.4% (4/119) to 0% (0/300) for E. faecium. Only 8.8% (7/80) of the chicken farms surveyed harboured VRE in 2003 compared with 25% (15/60) in 2000. All VRE were resistant to tetracycline and erythromycin. All VRE possess the vanA gene but nearly all (79 of 83 isolates) were susceptible to teicoplanin, indicating VanB phenotype. Some clones were detected from different farms in various regions over the years. We conclude that the frequency of VRE in chicken farms decreased in association with a ban on avoparcin; and the continued presence of VRE may be due to the ability of some strains to persist in the farms, transfer of vancomycin resistance determinants or co-selection by the continued use of other antibiotics.
journal_name
Environ Microbioljournal_title
Environmental microbiologyauthors
Lauderdale TL,Shiau YR,Wang HY,Lai JF,Huang IW,Chen PC,Chen HY,Lai SS,Liu YF,Ho Mdoi
10.1111/j.1462-2920.2006.01189.xsubject
Has Abstractpub_date
2007-03-01 00:00:00pages
819-23issue
3eissn
1462-2912issn
1462-2920pii
EMI1189journal_volume
9pub_type
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