Sisay Girma1, Girma Zewde2, Ketema Tafess3, and Tariku Jibat2*
1College of Veterinary Medicine, Haramaya University, P. O. Box 138, Dire Dawa, Ethiopia.
2School of Veterinary Medicine, Addis Ababa University, P. O. Box 34, Debre Zeit, Ethiopia.
3College of Medical Sciences, University of Gondar, P. O. Box 196, Gondar, Ethiopia.
