الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
First of all, I am greatly indebted in all my work and success to our merciful “ALLAH” who was the first helper to me and still giving his support and whose blessings to me are too many to be counted.My deepest gratitude and apprecication to Prof. Dr./ Mokhtar Mohamed Ali El-Tarabili, Professor of Virology, Faculty of Veterinary Medicine, Suez Canal University, for his supervision and continuous help.I would like to express my great thanks to Prof.Dr./ Mohamed Hassan Khodeir, chief of researches in Veterinary serum and vaccine research institute, for his priceless favors, valuable help, continuous interest, support and encouragement.My great thanks to all staff members of Veterinary serum and vaccine research institute, and Virology department, Faculty of Veterinary Medicine, Suez Canal University for their great help.