1. Department of Veterinary Medicine University of Bari Valenzano Bari Italy
2. Istituto Zooprofilattico Sperimentale dell'Abruzzo e del Molise 'G. Caporale' Teramo Italy
3. Istituto Zooprofilattico Sperimentale del Mezzogiorno Portici Italy
4. Istituto Zooprofilattico Sperimentale di Puglia e Basilicata Foggia Italy
5. Department of Veterinary Medicine and Animal Production University of Naples Federico II Naples Italy