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Journal of Clinical Microbiology, April 2002, p. 1530-1533, Vol. 40, No. 4
0095-1137/02/$04.00+0     DOI: 10.1128/JCM.40.4.1530-1533.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Four Strains of Escherichia coli O157:H7 Isolated from Patients during an Outbreak of Disease Associated with Ground Beef: Importance of Evaluating Multiple Colonies from an Outbreak-Associated Product

Mary E. Proctor,1* Terry Kurzynski,2 Cindy Koschmann,3 John R. Archer,1 and Jeffrey P. Davis1

Bureau of Communicable Diseases, Division of Public Health, Wisconsin Department of Health and Family Services, Madison, Wisconsin 53701,1 Wisconsin State Laboratory of Hygiene, University of Wisconsin—Madison, Madison, Wisconsin 53706,2 Bureau of Laboratory Services, Wisconsin Department of Agriculture, Trade and Consumer Protection, Madison, Wisconsin 537073

Received 13 September 2001/ Returned for modification 15 November 2001/ Accepted 20 January 2002

This report describes the investigation of a ground-beef-associated outbreak that involved five genetically distinct patient strains of Escherichia coli O157:H7. Human and product isolates were evaluated by pulsed-field gel electrophoresis (PFGE) with two endonucleases. The multiple-strain etiology of this outbreak underscores the importance of isolating and evaluating multiple colonies from outbreak-related products and comparing two endonuclease PFGE patterns of all product and human isolates identified during outbreak periods. This investigation emphasizes the importance of interviewing all confirmed and suspected case patients during the outbreak period, regardless of the PFGE pattern of their isolate, to confirm or rule out an epidemiologic link to the outbreak.

* Corresponding author. Present address: 917 Cornell Ct., Madison, WI 53705. Phone: (608) 233-3913. E-mail: proctm{at}aol.com.

Journal of Clinical Microbiology, April 2002, p. 1530-1533, Vol. 40, No. 4
0095-1137/02/$04.00+0     DOI: 10.1128/JCM.40.4.1530-1533.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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