SYVA brand Syvazul BTV (bluetongue virus, serotype 3, BTV-3/NET2023, inactivated) is used for active immunisation of sheep and cattle against bluetongue virus (BTV). Prevents viraemia in sheep caused by specific serotypes of Bluetongue virus, including BTV-1, BTV-8, and/or BTV-4. Prevents mortality, and reduces clinical signs and lesions in sheep caused by Bluetongue virus serotype 3 (BTV-3). An EU Authorised medicine.