Paramyxo or New-Castle disease is a very widespread viral infection among pigeons. In Belgium, in case of a paramyxo-infection, you are legally bound to report this very contagious disease. Mostly pigeons during the moult, exhausted and late young are very susceptible. Not or badly vaccinated pigeons are always at great risk.
The averige duration of this affection is 1 to 3 months. After healing good flight performances are still possible. Some pigeons however may get permanent damage e.g. turned neck or watery droppings.