1. Italian Reference Centre for TSEs, Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Valle d'Aosta, Turin, Italy
2. Biostatistic, Epidemiology and Risk Analysis Unit, Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Valle d'Aosta, Turin, Italy
3. Wageningen Bioveterinary Institute, Lelystad, The Netherlands
4. National Agricultural Research Foundation, Veterinary Research Institute, Thessaloniki, Greece
5. UMR INRA ENVT 1225, Interactions Hôtes Agents Pathogènes, Ecole Nationale Vétérinaire de Toulouse, Toulouse, France