The apparent failure of a vaccine to protect rams against naturally occurring Brucella ovis infection.
D000818:Animals; D002004:Brucella Vaccine; D002006:Brucellosis / Q000517:prevention & control / Q000662:veterinary*; D004823:Epididymitis / Q000209:etiology / Q000662:veterinary*; D008297:Male; D012756:Sheep; D012757:Sheep Diseases / Q000517:prevention & control*; D013733:Testicular Diseases / Q000209:etiology / Q000662:veterinary*
D002004:Brucella Vaccine