Abstract
1 Department of Comparative Biomedical Sciences, Faculty of Veterinary Medicine, University of Teramo, Teramo, Italy
2 Istituto Zooprofilattico Sperimentale della Sardegna, Sassari, Italy
3 Department of Veterinary Morphophysiology and Animal Productions, Faculty of Veterinary Medicine, University of Bologna, Ozzano Emilia (Bologna), Italy
4 Department of Veterinary Public Health and Animal Pathology, Division of Veterinary Pathology, Faculty of Veterinary Medicine, University of Bologna, Ozzano Emilia (Bologna), Italy
5 Istituto Zooprofilattico Sperimentale delle Regioni Lazio e Toscana, Viterbo, Italy
6 Istituto Superiore di Sanità, Department of Food Safety and Veterinary Public Health, Rome, Italy
7 Institute of Neuropathology, University Hospital of Zurich, Zurich, Switzerland