title: Concerns regarding retrospective study of reported scrapie in sheep.
authors.forename: G E
authors.initials: GE
authors.lastname: McKissick
mesh_terms: D000818:Animals; D012189:Retrospective Studies; D012608:Scrapie / Q000175:diagnosis* / Q000453:epidemiology*; D012756:Sheep; D014481:United States / Q000453:epidemiology