[1] Univ Naples Federico II, Cattedra Immunol, Dipartimento Sci Zootecn & Ispez Alimenti, Chair Immunol, I-80055 Naples, Italy
[2] Univ Naples Federico II, Fac Biotechnol Sci, I-80055 Naples, Italy
[3] Univ Naples Federico II, Ist Zooprofilatt Sperimentale Mezzogiorno, I-80055 Naples, Italy
[4] Univ Naples Federico II, Ist Zooprofilatt Sperimentale Puglia & Basilicata, I-80055 Naples, Italy
[5] Univ Naples Federico II, Fac Vet Med, I-80055 Naples, Italy
[6] Reg Campana, Assessorato Agricoltura, Naples, Italy