1. Justus Liebig University, Institute of Medical Microbiology, and German Center for Infection Research, Partner Site Giessen-Marburg-Langen, Giessen, Germany
2. Freie Universitaet Berlin, Institute for Animal Hygiene and Environmental Health, Berlin, Germany
3. University of Veterinary Medicine Hannover, Institute for Biometrics, Epidemiology and Information Processing, Hannover, Germany
4. Hessian State Laboratory (LHL), Giessen, Germany
5. Federal Institute for Risk Assessment, Department of Biological Safety, Berlin, Germany
6. Veterinary University Vienna, Institute for Veterinary Public Health, Vienna, Austria
7. Justus Liebig University Giessen, Institute of Hygiene and Infectious Diseases of Animals, Giessen, Germany