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==Introduction==

==Introduction==

Newcastle disease virus (NDV) (Avian Paramyxovirus type 1) is the causative agent of Newcastle Disease, an acute viral disease of domestic poultry and many other bird species that is usually fatal. It is characterised primarily by respiratory signs but neurological and gastrointestinal forms of the disease may also be seen. The disease is '''notifiable in the UK''' but virulent strains of the virus are endemic in most of Asia and Africa and South America. Sporadic cases of the disease have been reported in North America following importation of infected birds.

Newcastle disease virus (NDV) (Avian [[:Category:Paramyxovirinae|Paramyxovirus]] type 1) is the causative agent of Newcastle Disease, an acute viral disease of domestic poultry and many other bird species that is usually fatal. It is characterised primarily by respiratory signs but neurological and gastrointestinal forms of the disease may also be seen. The disease is '''notifiable in the UK''' but virulent strains of the virus are endemic in most of Asia and Africa and South America. Sporadic cases of the disease have been reported in North America following importation of infected birds.

==Transmission==

==Transmission==