[1] Univ Bari, Dipartimento Sanita Pubbl & Zootecn, I-70010 Valenzano Bari, Italy
[2] Univ Bari Aldo Moro, Dipartimento Biol, I-70125 Bari, Italy
[3] Ist Super Sanita, Dept Infect Parasit & Immunomediated Dis, I-00161 Rome, Italy
[4] Ist Zooprofilatt Venezie, Natl Reference Lab Salmonella, I-35020 Legnaro, Padova, Italy