1. Department of Internal Medicine, Faculty of Veterinary, Ataturk University, Erzurum 25240, Turkey.
2. Department of Internal Medicine, Faculty of Veterinary, Ondokuz Mayis University, Samsun 55139, Turkey.
3. Department of Biochemistry, Faculty of Veterinary, Ataturk University, Erzurum 25240, Turkey.
4. Department of Virology, Faculty of Veterinary, Ataturk University, Erzurum 25240, Turkey.