Northern Ireland livestock farmers have been urged to stay alert for signs of bluetongue as confirmed cases in Great Britain approach 500. The Ulster Farmers' Union (UFU) says nearly 1,000 individual animals have been infected and more than 2,000 potential cases remain under investigation.

UFU deputy president Clement Lynch described the unfolding situation in Great Britain as extremely concerning and a clear reminder of the serious threat the disease could pose to the Northern Ireland livestock sector.

The 2026/27 bluetongue season began on 10 July. The UFU noted an important change from the previous season: most confirmed cases this year were identified after animals developed clinical signs, whereas last season most cases were asymptomatic and found through pre-movement testing. Sheep are currently more likely to be identified showing symptoms, though farmers are advised to remain alert across all susceptible livestock.

Restrictions remain in place on movements of livestock from Great Britain to Northern Ireland. The UFU warned that if bluetongue cases rise within Northern Ireland, severe restrictions on movements back to the mainland would likely be reinstated, causing significant financial losses and disruption to the agricultural supply chain.

Derogations currently allow movements to and from the Republic of Ireland, but the UFU cautioned that an increase in cases or clinical signs could jeopardise this trade. With the first detection of BTV-3 cases in Scotland, the union is monitoring how the trade situation may evolve.

The rapid increase in cases is also putting pressure on bluetongue vaccine supplies in Great Britain. The UFU said high demand means farmers could face waits of up to four weeks to obtain vaccines, and some manufacturers currently have no stock available. Farmers considering vaccination are advised to speak to their private veterinary practitioner about the most appropriate approach for their individual farm.

Clinical signs of bluetongue can include high fever, inflammation of the mucous membranes of the mouth and nose, sores and ulceration, swelling of the head and neck, excessive salivation, nasal discharge, and stiffness or reluctance to move caused by swelling around the hooves.

Bluetongue is a notifiable disease. Farmers who suspect an animal may be affected are urged to report immediately to their private veterinary practitioner and to follow all advice relating to notifiable diseases. The UFU said vigilance on individual farms will be important in reducing the risk to Northern Ireland's livestock sector and the trade that depends upon it.