1. Department of Pathobiology; Institute of Immunology; University of Veterinary Medicine; Vienna Austria
2. Section of Paediatrics; Department of Medicine; Imperial College London; London UK
3. Department of Farm Animal Health; Faculty of Veterinary Medicine; Utrecht University; Utrecht The Netherlands
4. Department of Pathology and Microbiology; Faculty of Veterinary Medicine; University of Montreal; Saint-Hyacinthe QC Canada
5. Field Station for Epidemiology; University of Veterinary Medicine Hannover; Foundation; Bakum Germany