Experience on the safety and effectiveness of 45-20 vaccine under field conditions.
D000372:Agglutination Tests; D000818:Animals; D002004:Brucella Vaccine; D002007:Brucellosis, Bovine / Q000175:diagnosis / Q000517:prevention & control*; D002417:Cattle; D005260:Female; D007109:Immunity; D011247:Pregnancy
D002004:Brucella Vaccine