JAC Advance Access published online on November 1, 2002
Journal of Antimicrobial Chemotherapy, doi:10.1093/jac/dkf236
© 2002 by The British Society for Antimicrobial Chemotherapy
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Original Paper
1 US Food and Drug Administration,
Center for Veterinary Medicine, 8401 Muirkirk Road, Laurel, MD 20708
* Corresponding author. E-mail: ssimjee{at}cvm.fda.gov.
Received 2 April 2002
; revised 29 August 2002
; accepted 9 September 2002
The prevalence of streptogramin resistance genes in
enterococci recovered from retail poultry in the Greater Washington
DC area was examined. Forty-three chicken and 32 turkey retail samples
were analysed. Thirty-one non-Enterococcus faecalis enterococcal
strains were isolated that displayed MICs of quinupristin-dalfopristin
and virginiamycin of
Keywords: Enterococcus faecium, quinupristin-dalfopristin,
resistance
Prevalence of streptogramin resistance genes among Enterococcus isolates recovered from retail meats
in the Greater Washington DC area
2 3304 Marie Mount Hall, College
Park, MD 20742
3 US Food and Drug Administration,
Center for Veterinary Medicine, 8401 Muirkirk Road, Laurel, MD 20708; Department
of Cell Biology and Molecular Genetics,
University of Maryland, College Park, MD 20742, USA
4 mg/L. These included Enterococcus faecium (turkey n = 4,
chicken n = 23), Enterococcus
gallinarum (turkey n = 2, chicken n = 1) and Enterococcus hirae (chicken n = 1). The presence of streptogramin resistance
genes was examined by PCR in all non-E. faecalis isolates.
The vat(E) gene was detected in 10/23 chicken E. faecium and from 2/4 turkey E. faecium.
No other streptogramin resistance genes were detected by PCR. In
addition, erm(B) was detected in all the E.
faecium and E. gallinarum found in turkeys
and in 7/23 E. faecium found in chickens. The vat(E) gene was transferable by conjugation from
only two of the 12 E. faecium isolates (one from
chicken and one from turkey). This study suggests that there is
a high prevalence of low-level streptogramin resistance among enterococci
found in retail poultry and that other, yet to be identified, mechanisms
operate in these isolates that confer streptogramin resistance in
enterococci.
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