1. FG11 Division of Enteropathogenic Bacteria and Legionella, Robert Koch Institute, Wernigerode, Germany
2. German Federal Institute for Risk Assessment Berlin, Germany
3. Institute of Medical Microbiology and Hospital Hygiene, Otto-von-Guericke University Magdeburg, Magdeburg, Germany
4. Institute of Medical Microbiology and Hospital Epidemiology, Hannover Medical School, Hannover, Germany
5. Paderborn District, Health Office, Paderborn, Germany
6. Faculty of Agricultural and Nutritional Sciences, CAU Kiel, Kiel, Germany
7. Milk Hygiene, Faculty of Veterinary Medicine, LMU Munich, Oberschleißheim, Germany
8. Chemical and Veterinary Analytical Institute Ostwestfalen-Lippe (CVUA-OWL), Detmold, Germany
9. German-Austrian Binational Consiliary Laboratory for Listeria, Austrian Agency for Health and Food Safety (AGES), Vienna, Austria
10. Organ-specific Immune Regulation, Helmholtz Centre for Infection Research, Braunschweig, Germany