title: Persistence of Brucella abortus, strain 19 infection in immunized cattle.
mesh_terms: D000818:Animals; D000906:Antibodies / Q000032:analysis*; D002004:Brucella Vaccine / Q000627:therapeutic use; D002003:Brucella abortus / Q000302:isolation & purification*; D002007:Brucellosis, Bovine / Q000276:immunology* / Q000382:microbiology; D002417:Cattle; D005260:Female; D005865:Gestational Age; D008892:Milk / Q000382:microbiology*; D011247:Pregnancy; D014611:Vaccination
chemical_list: D000906:Antibodies; D002004:Brucella Vaccine