title: Investigations on the variability of pathogenicity of Newcastle disease virus. V. Influence of hypovitaminosis B2 or B12.
mesh_terms: D000818:Animals; D066298:In Vitro Techniques; D009522:Newcastle disease virus / Q000472:pathogenicity*; D011200:Poultry; D013832:Thiamine Deficiency; D014806:Vitamin B 12 Deficiency