1. Department of Animal Husbandry, University of Niš, Faculty of Agriculture , Kruševac, Kosančićeva 4, 37000 Kruševac , Serbia
2. Department of Microbiology and Immunology, Faculty of Medicine, University of Niš , 18000 Niš , Serbia
3. Institute of Public Health of Niš , 18000 Niš , Serbia
4. Department for Parasitology, University of Belgrade, Faculty of Veterinary Medicine , Bul. Oslobodjenja 18, 11000 Beograd , Serbia
5. Department of Animal Hygiene, University of Belgrade, Faculty of Veterinary Medicine , Belgrade, Bul. Oslobodjenja 18, 11000 Beograd , Serbia
6. Department for equine, small animal, poultry and wild animal diseases, University of Belgrade, Faculty of Veterinary Medicine , Bul. Oslobodjenja 18, 11000 Beograd , Serbia