Professor: Abd Elrahim Elsayed Karrar, Head of the Department of Clinical Medicine, Faculty of Veterinary Medicine, University of Khartoum. E-mail:rahim.karrar@yahoo.com.

Professor: Imadeldin. E. T. Aradaib, Dean of the Faculty of Veterinary Medicine, University of Khartoum. E-mail: aradaib@yahoo.com.

Professor: Suliman Mohamed Elsanousi, Department of Microbiology, Faculty of Veterinary Medicine, University of Khartoum. E-mail: S.M.Elsanousi@yahoo.co.U.K.