1. National Veterinary Institute, Department of Microbiology, Ulls väg 2B, 75189, Uppsala, Sweden
2. National Veterinary Institute, Department of Pathology and Wildlife Diseases, Ulls väg 2B, 75189, Uppsala, Sweden
3. National Veterinary Institute, Department of Disease Control and Epidemiology, Ulls väg 2B, 75189, Uppsala, Sweden
4. University of Parma, Department of Veterinary Science, via del Taglio 10, 43126, Parma, Italy