title: Immunization trials with virus-free antigens against Marek's disease.
mesh_terms: D000818:Animals; D000956:Antigens, Viral; D002645:Chickens; D007114:Immunization; D008380:Marek Disease / Q000276:immunology* / Q000401:mortality / Q000473:pathology; D011506:Proteins / Q000276:immunology; D012313:RNA / Q000276:immunology; D012867:Skin / Q000276:immunology*; D014422:Turkeys
chemical_list: D000956:Antigens, Viral; D011506:Proteins; D012313:RNA