1. L'Istituto Zooprofilattico Sperimentale dell'Abruzzo e del Molise “Giuseppe Caporale” (IZSAM); Teramo Italy
2. Department of Veterinary Science; University of Pisa; Pisa Italy
3. Faculty of Veterinary Medicine; University of Tripoli; Tripoli Libya
4. National Center of Animal Health; Tripoli Libya