Zulvac 1+8 Ovis (Inactivated Bluetongue Virus, serotype 1, strain BTV-1/ALG2006/01 E1 / Inactivated Bluetongue Virus, serotype 8, strain BTV-8/BEL2006/02) is a veterinary vaccine used in sheep to protect them against bluetongue virus, specifically serotypes 1 and 8, by preventing viraemia (the presence of the virus in the blood). It's administered as two injections under the skin, with the first dose given from one and a half months of age and the second three weeks later.