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Journal of Clinical Microbiology, October 2001, p. 3481-3485, Vol. 39, No. 10
0095-1137/01/$04.00+0   DOI: 10.1128/JCM.39.10.3481-3485.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Development of a Canadian Standardized Protocol for Subtyping Methicillin-Resistant Staphylococcus aureus Using Pulsed-Field Gel Electrophoresis

M. R. Mulvey,1,* L. Chui,2 J. Ismail,3 L. Louie,4 C. Murphy,1 N. Chang,2 M. Alfa,5 and the Canadian Committee for the Standardization of Molecular Methodsdagger

National Microbiology Laboratory, Health Canada,1 and St. Boniface Hospital,5 Winnipeg, Manitoba, Alberta Provincial Laboratory, Edmonton, Alberta,2 LSPQ/INSPQ, SainteAnne de Bellevue, Quebec,3 and Sunnybrook and Women's College and Health Science Centre, Toronto, Ontario,4 Canada

Received 1 May 2001/Returned for modification 30 May 2001/Accepted 22 July 2001

A panel of 24 methicillin-resistant Staphylococcus aureus strains was distributed to 15 laboratories in Canada to evaluate their in-house pulsed-field gel electrophoresis (PFGE) protocols and interpretation criteria. Attempts to compare fingerprint images using computer-aided analysis were not successful due to variability in individual laboratory PFGE protocols. In addition, individual site interpretation of the fingerprint patterns was inadequate, as 7 of 13 sites (54%) made at least one error in interpreting the fingerprints from the panel. A 2-day standardized PFGE protocol (culture to gel image) was developed and distributed to all of the sites. Each site was requested to use the standardized protocol on five strains from the original panel. Thirteen sites submitted gel images for comparisons. The protocol demonstrated excellent reproducibility and allowed interlaboratory comparisons with Molecular Analyst DST software (Bio-Rad) and 1.5% band tolerance.


* Corresponding author. Mailing address: National Microbiology Laboratory, Nosocomial Infections, 1015 Arlington St., Winnipeg, Manitoba, Canada R3E 3R2. Phone: (204) 789-2133. Fax: (204) 789-2018. E-mail: michael_mulvey{at}he-sc.gc.ca.

dagger Participants of The Canadian Committee for the Standardization of Molecular Methods: L. Abbott, Charlottetown, Prince Edward Island; M. Alfa, Winnipeg, Manitoba; S. Byrne, Vancouver, British Columbia; B. Ciebin, Toronto, Ontario; L. Chui, Edmonton, Alberta; C. Clark, Winnipeg, Manitoba; J. Conly, Toronto, Ontario; R. Davidson, Halifax, Nova Scotia; J. Farber, Ottowa, Ontario; K. Fonseca, Calgary, Alberta; G. Horsman, Regina, Saskatchwan; J. Ismail, Ste-Anne de Bellevue, Quebec; P. Jayaratne, Hamilton, Ontario; A. Kabani, Winnipeg, Manitoba; M. Kanchana, Saskatoon, Saskatchewan; L. Louie, Toronto, Ontario; A. McGeer, Toronto, Ontario; M. Mulvey, Winnipeg, Manitoba; G. Norris, St. John's, Newfoundland; M. Peppler, Edmonton, Alberta; G. Peters, London, Ontario; K. Ramotar, Ottowa, Ontario; J. Wylie, Winnipeg, Manitoba; and K. Ziebell, Guelph, Ontario.


Journal of Clinical Microbiology, October 2001, p. 3481-3485, Vol. 39, No. 10
0095-1137/01/$04.00+0   DOI: 10.1128/JCM.39.10.3481-3485.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.



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