title: [Research on the differentiation of pathogenic and attenuated strains of Newcastle disease virus].
mesh_terms: D000818:Animals; D001921:Brain / Q000473:pathology; D002478:Cells, Cultured; D002642:Chick Embryo; D002645:Chickens; D003588:Cytopathogenic Effect, Viral; D009521:Newcastle Disease / Q000473:pathology*; D009522:Newcastle disease virus / Q000145:classification / Q000472:pathogenicity*
vernacular_title: Richerche sulla differenziazione dei ceppi patogeni e attenuati del virus della malattia di Newcastle