Farmers in border counties are being urged to increase vigilance for bovine viral diarrhoea (BVD) ahead of the 2026 calving season.

Animal Health Ireland (AHI) and Animal Health and Welfare Northern Ireland (AHWNI) have advised farmers to strengthen biosecurity measures following a recent rise in BVD infection levels in herds across counties Armagh, Tyrone, Fermanagh and Monaghan.

Both AHI and AHWNI warn that while significant progress has been made towards BVD eradication on the island of Ireland, the emergence of localised infection clusters is a serious concern.

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A joint campaign has been launched outlining three clear steps for farmers which advises farmers to buy animals from lower risk herds, maintain secure boundaries and prevent direct contact with neighbouring herds, and to identify and remove persistently infected (PI) animals promptly. Dr Maria Guelbenzu, BVD programme manager at AHI said that BVD does not respect borders.

“We are urging all farmers in the border counties to take extra care. While farmers have made huge progress towards BVD eradication, the persistence of infection in a few areas shows how easily the virus can re-emerge. Early action and robust biosecurity are essential to protect herds and livelihoods.”

Dr Sam Strain, CEO of AHWNI , added that substantial progress has been made towards eradicating BVD.

“However, recently, we have seen an increase in BVD cases in some border areas. It is essential that farmers on both sides of the border continue to work together. By following practical steps now, we can protect the progress made and move closer to eliminating BVD.”