1. Department of Food and Environmental Hygiene, Faculty of Veterinary Medicine, University of Helsinki, Helsinki, Finland
2. Microbiology Unit, Department of Animal Diseases and Food Safety Research, Finnish Food Safety Authority Evira, Mustialankatu, Helsinki, Finland
3. Institute of Food Hygiene and Technology, Faculty of Veterinary Medicine, Ludwig‐Maximilians‐Universität Munich, Schönleutnerstrasse, Oberschleissheim, Germany