title: [Investigations of ovine pararickettsial abortion. (Study of the experimental disease and investigation of active immunization)].
mesh_terms: D000034:Abortion, Veterinary; D000818:Animals; D005260:Female; D011247:Pregnancy; D012282:Rickettsia Infections / Q000662:veterinary*; D012756:Sheep; D012757:Sheep Diseases; D034561:Sheep, Domestic; D014611:Vaccination
keywords: ABORTION/veterinary; RICKETTSIAL DISEASES/veterinary; SHEEP/diseases