title: Protection of chickens afforded by commercial lentogenic vaccines against challenge exposure to velogenic Newcastle disease virus.
mesh_terms: D000818:Animals; D002645:Chickens; D005069:Evaluation Studies as Topic; D009521:Newcastle Disease / Q000276:immunology* / Q000517:prevention & control; D009522:Newcastle disease virus / Q000276:immunology* / Q000472:pathogenicity; D014765:Viral Vaccines
chemical_list: D014765:Viral Vaccines