An evaluation of Newcastle disease virus spray vaccination programs of market turkeys.
Commercial market turkeys that were spray-vaccinated at 2 to 3 weeks of age with viable Newcastle disease virus (NDV) vaccine usually did not develop high or persistent levels of serum antibody as detected by the hemagglutination-inhibition test. Vaccinated turkeys exhibited a satisfactory level of resistance to infection and clinical disease when challenged by the oculonasal or aerosol route at 2 weeks post-vaccination, and they resisted clinical disease when challenged at 6 weeks, but the level of protection diminished by 10 weeks post-vaccination. It is suggested that market turkeys produced in an NDV-enzootic area may require two or more NDV vaccinations by spray during their growing period in order to be adequately protected against natural NDV infection.
Kelleher
C J
CJ
College of Veterinary Medicine, University of Minnesota, St. Paul 55018.
Halvorson
D A
DA
Newman
J A
JA
D000336:Aerosols; D000818:Animals; D000914:Antibodies, Viral / Q000032:analysis / Q000096:biosynthesis; D006385:Hemagglutination Inhibition Tests / Q000662:veterinary; D006801:Humans; D009521:Newcastle Disease / Q000517:prevention & control*; D009522:Newcastle disease virus / Q000276:immunology*; D014422:Turkeys; D014611:Vaccination / Q000662:veterinary*; D014765:Viral Vaccines
D000336:Aerosols; D000914:Antibodies, Viral; D014765:Viral Vaccines