1. Istituto Zooprofilattico Sperimentale del Lazio e della Toscana “M. Aleandri”, via Appia Nuova 1411, 00178 Rome, Italy
2. Agricultural Institute of Slovenia, Hacquetova ulica 17, 1000 Ljubljana, Slovenia
3. Servizi Veterinari ASL di Viterbo, via D. Alighieri 100, 01027 Montefiascone, Italy
4. Department of Veterinary Medicine, Food Safety Unit, University of Bari, Str. Prov. Casamassima Km 3, 70010 Valenzano, Italy