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==Description==

==Description==

Bluetongue is an infectious, noncontagious arthropodborne viral disease primarily of domestic and wild ruminants. Infection with bluetongue virus is common worldwide but is usually subclinical or mild in most infected ruminants. Bluetongue is almost exclusively a disease of sheep, particularly the fine-wool and mutton breeds, although white-tailed deer ( Odocoileus virginianus ), and pronghorn ( Antilocapra americana ) and desert bighorn sheep ( Ovis canadensis ) may develop severe clinical disease in North America.

Bluetongue is an infectious viral disease of ruminants that arthropod-borne and non-contagious.

==Aetiology==

==Aetiology==