title: Bluetongue--an analysis of current problems, with particular reference to importation of ruminants to the United States.
mesh_terms: D000383:Agriculture; D000818:Animals; D001819:Bluetongue / Q000175:diagnosis / Q000517:prevention & control* / Q000635:transmission; D001820:Bluetongue virus / Q000235:genetics / Q000302:isolation & purification; D002417:Cattle; D006291:Health Policy; D012756:Sheep; D014481:United States