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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
Methods
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.

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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