1. Division of Veterinary Medicine and Animal Surgery, College of Veterinary Medicine, Sudan University of Science and Technology, P.O. Box 204, Hilat Kuku, 11111 Khartoum North, Sudan
2. Department of Pathology, Faculty of Veterinary Medicine, University of Khartoum (U of K), P.O. Box 32, 11111 Shambat, Sudan
3. Department of Surgery and Anesthesiology, Faculty of Veterinary Medicine, University of Khartoum (U of K), P.O. Box 32, 11111 Shambat, Sudan