Efficacy of an inactivated aqueous-suspension Newcastle disease virus vaccine against paramyxovirus type 1 infection in young pigeons with varying amounts of maternal antibody.

Pigeons aged 3 weeks were vaccinated, subcutaneously, with an inactivated aqueous-suspension LaSota vaccine. Irrespective of the level of maternally-derived antibodies the single vaccination gave protection lasting 1 year as shown by resistance against an intramuscular challenge with a virulent 'pigeon' PMV-1 strain.