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Journal of Clinical Microbiology, December 2004, p. 5895-5898, Vol. 42, No. 12
0095-1137/04/$08.00+0     DOI: 10.1128/JCM.42.12.5895-5898.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.

Vancomycin Resistance, esp, and Strain Relatedness: a 1-Year Study of Enterococcal Bacteremia

S. M. Harrington,1 T. L. Ross,1 K. A. Gebo,2 and W. G. Merz1*

Department of Pathology,1 Department of Medicine, The Johns Hopkins Medical Institutions, Baltimore, Maryland2

Received 7 May 2004/ Returned for modification 11 June 2004/ Accepted 13 August 2004

The prevalence of esp, a gene associated with infection-derived and outbreak strains, in enterococcal blood isolates from 2002 was determined. Fifty-five of 137 (40.1%) Enterococcus faecalis isolates, 30 of 58 (51.7%) E. faecium isolates, 1 of 1 E. raffinosus isolate, 0 of 4 E. gallinarum isolates, and 0 of 1 E. casseliflavus isolate were positive. esp wasn't associated with vancomycin resistance (VR) or clinical service. VR E. faecium isolates were less genetically diverse than vancomycin-susceptible strains. A large cluster of VR isolates, belonging to esp-positive E. faecium, was revealed. These data support the hypothesis that esp and VR may contribute to dissemination of particular clones.

* Corresponding Author. Mailing address: Microbiology, Meyer B1-193, Department of Pathology, The Johns Hopkins Hospital, Baltimore, MD 21287-7093. Phone: (410) 955-5077. Fax: (410) 614-8087. E-mail: wmerz{at}jhmi.edu.

Journal of Clinical Microbiology, December 2004, p. 5895-5898, Vol. 42, No. 12
0095-1137/04/$08.00+0     DOI: 10.1128/JCM.42.12.5895-5898.2004
Copyright © 2004, American Society for Microbiology. All Rights Reserved.



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