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Volume 18, Number 9—September 2012

Yersinia enterocolitica Outbreak Associated with Ready-to-Eat Salad Mix, Norway, 2011

Emily MacDonaldComments to Author , Berit Tafjord Heier, Karin Nygård, Torunn Stalheim, Kofitsyo S. Cudjoe, Taran Skjerdal, Astrid Louise Wester, Bjørn-Arne Lindstedt, Trine-Lise Stavnes, and Line Vold
Author affiliations: Norwegian Institute of Public Health, Oslo, Norway (E. MacDonald, B.T. Heier, K. Nygård, A.L. Wester, B.-A. Lindstedt, T.-L. Stavnes, L. Vold); Norwegian Food Safety Authority, Oslo (T. Stalheim); and Norwegian Veterinary Institute, Oslo (K.S. Cudjoe, T. Skjerdal)

Main Article


Results from univariate conditional logistic regression analyses of a Yersinia enterocolitica outbreak, Norway, February–April 2011

Exposure No. cases, n = 9 No. controls, n = 26* Matched odds ratio† (95% CI) p value
Ready-to-eat salad mix 6 3 13.7 (1.6–116.3) 0.02
Diced ham, ham pieces 5 3 6.3 (1.2–32.9) 0.03
Chicken breast 8 9 10.0 (1.2–83.6) 0.03
Arugula 7 8 9.8 (1.2–83.6) 0.04
Pork chops 4 3 8.4 (0.9–78.6) 0.06
Bean sprouts 3 1 8.2 (0.8–79.3) 0.07
Sugar peas 6 8 3.7 (0.9–16.1) 0.08
Iceberg lettuce 8 13 6.6 (0.8–57.5) 0.09

*n = 25 for ready-to-eat salad mix.

Main Article

Page created: August 17, 2012
Page updated: August 17, 2012
Page reviewed: August 17, 2012
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