title: Dual infection of chickens with acute and mild strains of Marek's disease herpesvirus.
mesh_terms: D000208:Acute Disease; D000818:Animals; D002645:Chickens; D006564:Herpesviridae / Q000302:isolation & purification / Q000472:pathogenicity*; D008380:Marek Disease / Q000209:etiology / Q000276:immunology / Q000382:microbiology*; D011201:Poultry Diseases / Q000209:etiology*