1. Bacteriology and Mycology, Department of Veterinary Sciences, Ludwig-Maximilians-Universität Munich, Munich, Germany
2. Chair of Food Safety, Department of Veterinary Sciences, Veterinary Faculty, Ludwig-Maximilians-Universität Munich, Oberschleissheim, Germany
3. Bayerische Kontrollbehörde für Lebensmittelsicherheit und Veterinärwesen, Kulmbach, Germany
4. Kazimierz Wielki University, Faculty of Biological Sciences, Department of Physiology and Toxicology, Bydgoszcz, Poland
5. Institute of Animal Science, University of Hohenheim, Stuttgart, Germany
6. Institute of Animal Nutrition, Friedrich-Loeffler-Institute, Braunschweig, Germany