1. Department of Veterinary Medicine, University of Perugia, Perugia, Italy
2. Istituto Zooprofilattico Sperimentale dell’Umbria e delle Marche, “Togo Rosati”, Perugia, Italy
3. Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, CO, USA
4. Department of Bioscience and Technology for Food, Agriculture and Environment, University of Teramo, Teramo, Italy
5. Azienda Sanitaria Locale 2 - Lanciano Vasto Chieti, Chieti, Italy