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Escherichia coli O157:H7 outbreak linked to salami, British Columbia, Canada, 1999

Published online by Cambridge University Press:  26 February 2004

D. M. MacDONALD
Affiliation:
Health Canada, Population and Public Health Branch, Field Epidemiology Training Program, Ottawa, Canada BC Centre for Disease Control, Vancouver, BC, Canada
M. FYFE
Affiliation:
BC Centre for Disease Control, Vancouver, BC, Canada
A. PACCAGNELLA
Affiliation:
BC Centre for Disease Control, Vancouver, BC, Canada
A. TRINIDAD
Affiliation:
BC Centre for Disease Control, Vancouver, BC, Canada
K. LOUIE
Affiliation:
South Fraser Health Region, Surrey, BC, Canada
D. PATRICK
Affiliation:
BC Centre for Disease Control, Vancouver, BC, Canada
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Abstract

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An outbreak of E. coli O157:H7 infections was identified in November 1999 with a fivefold increase in the occurrence of laboratory-confirmed cases of E. coli O157:H7 infection. A matched case-control study was conducted. Samples of food from cases and from retailers were analysed for the presence of E. coli O157:H7. A total of 143 cases were identified over a 12-week period with the same pulsed-field gel electrophoresis (PFGE) pattern. The case-control study found that Company A salami was significantly associated with illness (Mantel–Haenszel matched odds ratio 10·0, 95% CI 1·4–434, P=0·01). Company A salami tested positive for E. coli O157:H7 and isolates had the same PFGE pattern as case isolates. An immediate voluntary national recall of Company A dry fermented meat products took place. Findings from the investigation of this outbreak suggest that the hold-and-test option may not be adequate to prevent shiga-toxigenic Escherichia coli (STEC) infection in salami consumers.

Type
Research Article
Copyright
© 2003 Cambridge University Press