title: Plaque assay for avirulent (lentogenic) strains of Newcastle disease virus.
abstract: Avirulent (lentogenic) strains of Newcastle disease virus form plaques on chicken embryo lung monolayers in 48 to 72 h.
mesh_terms: D000818:Animals; D002642:Chick Embryo; D046508:Culture Techniques; D008168:Lung; D008722:Methods; D009522:Newcastle disease virus / Q000302:isolation & purification*; D010948:Viral Plaque Assay; D014774:Virulence; D014776:Virus Cultivation