title: A potency test for live Newcastle disease vaccines.
mesh_terms: D000818:Animals; D002645:Chickens / Q000276:immunology*; D004341:Drug Evaluation; D009521:Newcastle Disease / Q000517:prevention & control*; D009522:Newcastle disease virus / Q000276:immunology*; D012015:Reference Standards; D014765:Viral Vaccines / Q000592:standards*
chemical_list: D014765:Viral Vaccines