NFU urges high biosecurity standards after AI confirmed in sheep

First published24 March 2025

Sheep seeking shelter under a tree while brown hens graze around them.

NFU President Tom Bradshaw is urging all keepers of domesticated poultry, cattle, sheep and goats to maintain high standards of biosecurity, as a case of avian influenza is confirmed in a single sheep in Yorkshire.

The UK’s Chief Veterinary Officer has confirmed a case of influenza of avian origin (H5N1) in a single sheep in Yorkshire following repeat positive milk testing.

Defra has said the case was identified following routine surveillance of co-located livestock on a premises where avian influenza had been confirmed in captive birds.

‘All keepers must maintain high standards of biosecurity’

NFU President Tom Bradshaw said: “Farmers are understandably concerned that avian influenza has been found in a sheep.

“This remains a single case within what is understood to be a backyard flock, and no other infection has been found among the remaining sheep.

“Commercial producers continue to do all they can to protect their animals by following strict biosecurity measures.

“While the risk to the nation’s livestock population remains low, it’s vital that all keepers of domesticated poultry, cattle, sheep and goats maintain high standards of biosecurity and remain vigilant for any signs of disease.”

The infected sheep has been humanely culled to enable extensive testing. Further testing in the remaining flock of sheep at the premises was undertaken by the avian influenza national reference laboratory at the Animal and Plant Health Agency Weybridge laboratory.

No further infection with avian influenza virus was detected in the remaining flock and this remains a single case in a mammal detected on the premises. 

Reporting suspected bird flu

If you suspect bird flu in poultry or other captive birds, you must report it immediately:

Any dead waterfowl or wild birds that you find on your land must be reported to Defra so they can be tested. Visit: GOV.UK | Report dead wild birds

For more information on signs, symptoms and reporting, visit: GOV.UK | Bird flu: how to spot and report it in poultry or other captive birds

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