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Journal of Clinical Microbiology, January 2005, p. 462-463, Vol. 43, No. 1
0095-1137/05/$08.00+0     doi:10.1128/JCM.43.1.462-463.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Emerging Incidence of Enterococcus faecium among Hospital Isolates (1993 to 2002)

Adam N. Treitman, Paul R. Yarnold, John Warren, and Gary A. Noskin*

Division of Infectious Diseases, Department of Medicine, and Departments of Emergency Medicine and Pathology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois

Received 19 July 2004/ Returned for modification 20 August 2004/ Accepted 8 September 2004

Historically, most clinical microbiology laboratories report that 80 to 90% of enterococci are Enterococcus faecalis, whereas E. faecium accounts for 5 to 10% of isolates. At our medical center from 1993 to 2002, we evaluated the percentages of E. faecium among all enterococcal isolates and the percentages of E. faecium isolates that were vancomycin resistant. Over this 10-year period, the percentage of enterococci that were identified as E. faecium increased from 12.7 to 22.2% (P < 0.001) and the proportion of E. faecium that was vancomycin resistant increased from 28.9 to 72.4% (P < 0.001). Both the percentage of E. faecium among the enterococci and the proportion of vancomycin-resistant E. faecium increased significantly over this 10-year period.

* Corresponding author. Mailing address: Division of Infectious Diseases, Feinberg School of Medicine, 251 E. Huron, Galter 3-210, Chicago, IL 60611. Phone: (312) 926-2729. Fax: (312) 926-7845. E-mail: gnoskin{at}northwestern.edu.

Journal of Clinical Microbiology, January 2005, p. 462-463, Vol. 43, No. 1
0095-1137/05/$08.00+0     doi:10.1128/JCM.43.1.462-463.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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