title: The influence of B1 Newcastle disease vaccine upon immunity by revaccination with tissue culture Newcastle disease vaccine.
mesh_terms: D000818:Animals; D006385:Hemagglutination Inhibition Tests; D007109:Immunity; D009521:Newcastle Disease / Q000276:immunology / Q000662:veterinary*; D011201:Poultry Diseases / Q000276:immunology*; D014611:Vaccination / Q000662:veterinary; D014765:Viral Vaccines
chemical_list: D014765:Viral Vaccines