The Shamonda virus has been detected in cattle at two dairy farms in the United Kingdom, with one case identified in Powys, Wales, and another in Shropshire, England. The Department for Environment, Food and Rural Affairs (Defra) confirmed the detections on November 2, 2026, highlighting the importance of continued livestock disease surveillance and monitoring.
The virus is believed to spread through bites from Culicoides midges, small biting insects that can transmit certain livestock diseases. Shamonda virus has been identified in cattle across several European countries during 2026, with Ireland reporting its first detection last month.
The latest UK detections follow an earlier confirmation of the virus in cattle in Jersey in August. According to Defra, the new findings were not unexpected given the virus’s detection in other parts of Europe.
Symptoms and Potential Impact on Dairy Cattle
Shamonda virus primarily affects cattle and can cause several clinical symptoms, including fever, diarrhoea and lethargy. In dairy animals, infection may also lead to reduced milk production, potentially affecting farm output and productivity.
Abortions have also been documented in infected cattle, making the disease a concern for herd health and reproductive management.
Reduced milk production can have financial implications for dairy farmers, particularly when multiple animals within a herd are affected. Illness may also increase veterinary treatment requirements and create additional management challenges for farm operators.
The suspected involvement of biting midges highlights the importance of understanding insect-borne disease transmission in livestock systems. Vector activity and environmental conditions can influence the spread of diseases transmitted by these insects, making surveillance particularly important across regions where cattle populations are exposed.
UK Authorities Continue Disease Surveillance
Defra stated that the latest detections demonstrate the effectiveness of the UK’s surveillance and diagnostic systems in identifying new and emerging livestock diseases.
The department clarified that Shamonda virus is currently not classified as a notifiable or reportable disease in the UK. It also stated that there is no evidence at present to suggest that additional disease-control measures are required following the latest detections.
Defra, working alongside the Welsh Government, the Scottish Government and the Animal and Plant Health Agency (APHA), will continue monitoring the epidemiological situation. The authorities will review their response as further information and scientific evidence become available.
The confirmation of cases on two dairy farms reinforces the importance of veterinary monitoring and diagnostic capacity in identifying emerging livestock health risks. Early identification can help farmers and veterinary professionals assess affected animals and respond appropriately.
Guidance for Dairy Farmers and Livestock Keepers
Defra has advised livestock keepers to remain alert to possible clinical signs in their animals and contact their private veterinarians if they have concerns. It has also recommended that animals be treated according to their clinical symptoms as early as possible.
For dairy farmers, regular herd observation is important for identifying changes in animal behaviour, appetite, body condition and milk output. Monitoring reproductive performance and reporting unusual health patterns to veterinary professionals can also support timely investigation.
Although the authorities have not recommended additional disease-control measures, continued vigilance remains important as the virus is detected in more European locations.
The latest cases highlight the need for effective livestock surveillance, accessible veterinary diagnostics and cooperation between farmers and animal-health authorities. For the dairy industry, protecting cattle health remains essential not only for maintaining milk production but also for safeguarding herd productivity and farm-level incomes.
