1. Department of Microbiology and Clinical Immunology; Faculty of Veterinary Medicine; University of Warmia and Mazury in Olsztyn; Olsztyn Poland
2. Department of Pathophysiology, Forensic Veterinary Medicine and Administration; Faculty of Veterinary Medicine; University of Warmia and Mazury in Olsztyn; Olsztyn Poland
3. Department of Pathological Anatomy; Faculty of Veterinary Medicine; University of Warmia and Mazury in Olsztyn; Olsztyn Poland
4. Department of Epizootiology; Faculty of Veterinary Medicine; University of Warmia and Mazury in Olsztyn; Olsztyn Poland
5. Department Fish Pathology and Immunology; Inland Fisheries Institute in Olsztyn; Olsztyn Poland