1. Department of Internal Medicine, Faculty of Veterinary, Ondokuz Mayis University, 55139 Atakum/Samsun, Turkey
2. Department of Internal Medicine, Faculty of Veterinary, Ataturk University, 25240 Yakutiye/Erzurum, Turkey
3. Department of Virology, Faculty of Veterinary, Erciyes University, 38280 Talas/Kayseri, Turkey
4. Department of Biochemistry, Faculty of Veterinary, Ataturk University, 25240 Yakutiye/Erzurum, Turkey