Background and Aims :Newcastle disease is considered the most contagious poultry disease and may cause severe economic loss in the poultry industry. The virus belongs to the Avulavirus genus within the family Paramyxoviridae. subfamily Paramyxovirinae. of the order Mononegavirales and is designated avian paramyxovirus-1. https://unitedssports.shop/product-category/volleyball-balls-training/