1. Faculty of Veterinary Medicine; University ‘St Kiril and Metodij’; Lazar Pop Trajkov 5-7 Skopje 91000 Macedonia
2. Veterinary Institute; Lazar Pop Trajkov 5-7 Skopje 91000 Macedonia
3. Istituto Zooprofilattico Sperimentale della Sicilia ‘A Mirri’; Palermo 90129 Italy
4. Veterinary Laboratories Agency-Weybridge; New Haw Addlestone Surrey KT15 3NB