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Applied and Environmental Microbiology, December 2003, p. 7153-7160, Vol. 69, No. 12
0099-2240/03/$08.00+0 DOI: 10.1128/AEM.69.12.7153-7160.2003
Prevalence and Antimicrobial Resistance of Enterococcus Species Isolated from Retail Meats
Joshua R. Hayes,1,2 Linda L. English,2 Peggy J. Carter,2 Terry Proescholdt,2 Kyung Y. Lee,2 David D. Wagner,2 and David G. White2*
Department
of Cell Biology and Molecular Genetics, University of Maryland, College
Park, Maryland 20742,1
Center for
Veterinary Medicine, U.S. Food and Drug Administration, Laurel,
Maryland 207082
Received 16 May 2003/
Accepted 10 September 2003
From
March 2001 to June 2002, a total of 981 samples of retail raw meats
(chicken, turkey, pork, and beef) were randomly obtained from 263
grocery stores in Iowa and cultured for the presence of
Enterococcus spp. A total of 1,357 enterococcal isolates were
recovered from the samples, with contamination rates ranging from
97% of pork samples to 100% of ground beef samples.
Enterococcus faecium was the predominant species recovered
(61%), followed by E. faecalis (29%), and E.
hirae (5.7%). E. faecium was the predominant
species recovered from ground turkey (60%), ground beef
(65%), and chicken breast (79%), while E.
faecalis was the predominant species recovered from pork chops
(54%). The incidence of resistance to many production and
therapeutic antimicrobials differed among enterococci recovered from
retail meat samples. Resistance to quinupristin-dalfopristin, a human
analogue of the production drug virginiamycin, was observed in 54, 27,
9, and 18% of E. faecium isolates from turkey, chicken,
pork, and beef samples, respectively. No resistance to linezolid or
vancomycin was observed, but high-level gentamicin resistance was
observed in 4% of enterococci, the majority of which were
recovered from poultry retail meats. Results indicate that
Enterococcus spp. commonly contaminate retail meats and that
dissimilarities in antimicrobial resistance patterns among enterococci
recovered from different meat types may reflect the use of approved
antimicrobial agents in each food animal production
class.
* Corresponding
author. Mailing address: Center for Veterinary Medicine, U.S. Food and
Drug Administration, Laurel, MD 20708. Phone: (301) 827-8037. Fax:
(301) 827-8250. E-mail:
dwhite{at}cvm.fda.gov.
Applied and Environmental Microbiology, December 2003, p. 7153-7160, Vol. 69, No. 12
0099-2240/03/$08.00+0 DOI: 10.1128/AEM.69.12.7153-7160.2003
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