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Newcastle disease is a virus from the family '''Paramyxoviridae'''.  Avian paramyxovirus 1 affects chickens, ducks, pheasants, geese and turkeys. The virus is stable in carcasses for weeks, so has the potential to affect a large amount of

 

Newcastle disease virus is the causative agent of Newcastle Disease, an acute viral disease of domestic poultry and many other bird species that is usually fatal.

 

Infected birds shed the virus through droppings and secretions from the nose, mouth and eyes. The virus may also be present in eggs laid during the clinical disease. The virus is commonly transferred by the movement of people and contaminated equipment.

 

NDV affects the gastrointestinal, respiratory and nervous systems and clinical signs reflect the system(s) affected. Clinical signs are usually acute and may appear throughout the flock within 2-12 days. Respiratory signs may include dyspnoea, sneezing, nasal discharge and coughing and are common with low virulence infections.

[[Image:Newcastle Disease.jpg|150px|thumb|right|''Newcastle Disease'' <br> L. Mahin, Wikimedia Commons]]

[[Image:Newcastle Disease.jpg|150px|thumb|right|''Newcastle Disease'' <br> L. Mahin, Wikimedia Commons]]