Document Type : Original Article
Authors
1 department of virology. faculty of veterinary medicine. Benha University , Benha, Egypt
2 Department of virology, faculty of veterinary medicine ,Benha university , Benha , Egypt
3 Veterinary serum and vaccine research institute (VSVRI)
4 Head of virology department,faculty of veterinary medicine ,Benha university,Benha,Egypt
Abstract
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