title: Evidence for a herpesvirus as an etiologic agent of marek's disease.
mesh_terms: D000818:Animals; D001353:Avian Leukosis / Q000209:etiology*; D002645:Chickens; D006564:Herpesviridae / Q000302:isolation & purification; D006566:Herpesviridae Infections / Q000150:complications*