1. Department of Veterinary Medical Sciences, University of Bologna, Ozzano dell’Emilia, BO, Italy
2. Division of Avian Diseases, Kimron Veterinary Institute, Bet Dagan, Israel
3. Istituto Zooprofilattico Sperimentale della Lombardia e dell’Emilia Romagna, Sezione Diagnostica di Forlì, Forlì, FC, Italy