Newcastle disease (ND) is a serious avian disease with worldwide distribution that can cause severe economic losses in the poultry indusity.The causative agent of the disease, Newcastle disease virus (NDV) or avian paramyxovirus type 1, is a member of the Paramyxoviridae and has been assigned to the genus Rubulavirus in the subfamily Paramyxovirinae. Avian Paramyxovirus consisted of nine serotypes, APMV 1~9, but APMV-1 only included Newcastle disease virus. There existed tremendous virulence d...