title: Apathogenic strains of Newcastle disease.
mesh_terms: D000818:Animals; D000914:Antibodies, Viral / Q000032:analysis*; D001715:Bird Diseases / Q000517:prevention & control*; D001717:Birds; D009521:Newcastle Disease / Q000276:immunology*; D014765:Viral Vaccines
chemical_list: D000914:Antibodies, Viral; D014765:Viral Vaccines