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Journal of Clinical Microbiology, March 2005, p. 1045-1050, Vol. 43, No. 3
0095-1137/05/$08.00+0     doi:10.1128/JCM.43.3.1045-1050.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Establishment of a Universal Size Standard Strain for Use with the PulseNet Standardized Pulsed-Field Gel Electrophoresis Protocols: Converting the National Databases to the New Size Standard

Susan B. Hunter,1* Paul Vauterin,2 Mary Ann Lambert-Fair,1 M. Susan Van Duyne,1 Kristy Kubota,1 Lewis Graves,1 Donna Wrigley,3 Timothy Barrett,1 and Efrain Ribot1

Centers for Disease Control and Prevention, Atlanta, Georgia,1 Applied Maths, Sint-Martens-Latem, Belgium,2 State of Maine Public Health and Environmental Laboratory, Augusta, Maine3

Received 26 May 2004/ Returned for modification 7 July 2004/ Accepted 3 October 2004

The PulseNet National Database, established by the Centers for Disease Control and Prevention in 1996, consists of pulsed-field gel electrophoresis (PFGE) patterns obtained from isolates of food-borne pathogens (currently Escherichia coli O157:H7, Salmonella, Shigella, and Listeria) and textual information about the isolates. Electronic images and accompanying text are submitted from over 60 U.S. public health and food regulatory agency laboratories. The PFGE patterns are generated according to highly standardized PFGE protocols. Normalization and accurate comparison of gel images require the use of a well-characterized size standard in at least three lanes of each gel. Originally, a well-characterized strain of each organism was chosen as the reference standard for that particular database. The increasing number of databases, difficulty in identifying an organism-specific standard for each database, the increased range of band sizes generated by the use of additional restriction endonucleases, and the maintenance of many different organism-specific strains encouraged us to search for a more versatile and universal DNA size marker. A Salmonella serotype Braenderup strain (H9812) was chosen as the universal size standard. This strain was subjected to rigorous testing in our laboratories to ensure that it met the desired criteria, including coverage of a wide range of DNA fragment sizes, even distribution of bands, and stability of the PFGE pattern. The strategy used to convert and compare data generated by the new and old reference standards is described.

* Corresponding author. Mailing address: Centers for Disease Control and Prevention 1600 Clifton Rd., Mail Stop C03, Atlanta, GA 30333. Phone: (404) 639-1749. Fax: (404) 639-3333. E-mail: sbh1{at}cdc.gov.

Journal of Clinical Microbiology, March 2005, p. 1045-1050, Vol. 43, No. 3
0095-1137/05/$08.00+0     doi:10.1128/JCM.43.3.1045-1050.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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