1. Faculty of Biosciences and Agro-Food and Environmental Technology, University of Teramo, Teramo, Italy
2. Istituto Zooprofilattico Sperimentale dell′ Abruzzo e del Molise G. Caporale (IZSAM), Teramo, Italy
3. Faculty of Veterinary Medicine, University of Maiduguri, Maiduguri, Nigeria
4. Faculty of Veterinary Medicine, Ahmadu Bello University, Zaria, Nigeria