[1] Univ Bari Aldo Moro, Dept Vet Med, Str prov leper Casamassima km 3, I-70010 Bari, BA, Italy
[2] Univ Nigeria, Dept Vet Pathol & Microbiol, Nsukka 410001, Nigeria
[3] Boehringer Ingelheim Anim Hlth, F-69007 Lyon, France
[4] Univ Messina, Dept Chem Biol Pharmaceut & Environm Sci, I-98122 Messina, Italy
[5] City Univ Hong Kong, Dept Vet Clin Sci, Hong Kong 518057, Peoples R China