1. Department of Animal Pathology; University of Turin; Via L. Da Vinci 44 10095 Grugliasco TO Italy
2. Strada Statale Monregalese 4/D; 12080 Pianfei CN Italy
3. National Reference Centre for TSE; Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Valle d'Aosta; Via Bologna 148 10154 Torino TO Italy