title: Breakdown in S.19-vaccinated herds.
mesh_terms: D000034:Abortion, Veterinary / Q000209:etiology; D000818:Animals; D002004:Brucella Vaccine / Q000009:adverse effects*; D002003:Brucella abortus / Q000302:isolation & purification; D002007:Brucellosis, Bovine / Q000517:prevention & control*; D002417:Cattle; D005260:Female; D011247:Pregnancy; D014774:Virulence
chemical_list: D002004:Brucella Vaccine