1. Department of General and Clinical Pathology, Faculty of Veterinary Medicine, Trakia University, Stara Zagora, Bulgaria
2. Department of Biochemistry, Microbiology and Physics, Faculty of Agriculture, Trakia University, Stara Zagora, Bulgaria
3. Department of Hygiene, Technology and Control of Food Products of Animal Origin, Veterinary Legislation and Management, Faculty of Veterinary Medicine, Trakia University, Stara Zagora, Bulgaria
4. Department of Internal Noninfectious Diseases, Faculty of Veterinary Medicine, Trakia University, Stara Zagora, Bulgaria
5. Department of Veterinary Microbiology, Infectious and Parasitic Diseases, Faculty of Veterinary Medicine, Trakia University, Stara Zagora, Bulgaria