We are especially grateful to Dr Rita Prager for performing the PFGE. Without her work, the outbreak investigation would not have been possible. We would also like to thank participating patients and controls, local and federal public health offices that provided contact details from cases and conducted interviews themselves. We thank the Food Safety Authorities for their investigation and support. We thank the physicians for sending samples for diagnostic testing, laboratories that provided isolates for further subtyping and all partners in countries that replied to our urgent inquiry on EPIS. For providing sequence reads for genome comparison, we wish to thank Eva Litrup (Statens Serum Institut, Copenhagen), Jacquelyn McCormick (Public Health England, London), Martin Cormican (National University of Ireland, Galway) and Simon Le Hello and Laetitia Fabre (Institut Pasteur, Paris). The authors are very grateful for the statistical support from Irina Czogiel and the team from the Postgraduate Training in Applied Epidemiology at the Robert Koch Institute. We would also like to thank Bettina Rosner from Robert Koch Institute for sharing preliminary, unpublished results of a food consumption survey in Germany.
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