Letter: Brucella ovis vaccination of rams.
D000818:Animals; D002006:Brucellosis / Q000517:prevention & control / Q000662:veterinary*; D007274:Injections, Intraperitoneal; D008297:Male; D012756:Sheep; D012757:Sheep Diseases / Q000517:prevention & control*; D014611:Vaccination / Q000662:veterinary*