What is bluetongue virus in sheep?
Bluetongue virus (BTV) is a vector-borne viral disease of ruminants that is most severe in sheep. It is transmitted by biting midges (Culicoides species) and tends to occur seasonally when insect activity is highest. Bluetongue virus in sheep can range from mild illness to severe systemic disease.
What are the symptoms of bluetongue in sheep?
Common clinical signs include:
- Fever and depression
- Swelling of the face, lips, or tongue
- Excessive salivation and oral lesions
- Nasal discharge
- Lameness or stiffness
Severe cases of bluetongue disease in sheep may lead to weight loss, reproductive loss, or death.
How is bluetongue virus transmitted?
Bluetongue virus is primarily spread through biting midges. It is not typically transmitted directly between animals. Outbreaks are most common in warm, wet conditions that support insect populations.
How is bluetongue in sheep prevented?
There is no specific treatment for bluetongue virus. Prevention focuses on reducing exposure to biting midges through insect control, environmental management, and seasonal risk awareness. Vaccination may be considered in some regions depending on local risk and circulating virus strains.
Acknowledgment
This FAQ was developed using content from WSU’s Veterinary Medicine Extension.
This information is not meant to be a substitute for veterinary care. Always follow the instructions provided by your veterinarian. Washington State University assumes no liability for injury to you or your animals incurred by following these descriptions or procedures.