All 27,000 chickens at a farm in Suffolk will be culled after a strain of bird flu was detected.
Low pathogenic avian influenza (LPAI) was confirmed on the commercial farm near Athelington in mid-Suffolk on Tuesday, the Department for Environment, Food and Rural Affairs (Defra) confirmed.
The farm's 27,000 birds will now be humanely culled and a one kilometre restriction zone around the farm, which covers about seven other farms, has been put in place to limit the risk of the disease spreading.
Public Health England (PHE) said the strain means the risk to public health is "very low".
The Food Standards Agency said bird flu does not pose a food safety risk and thoroughly cooked poultry and poultry products, including eggs, are safe to eat.
An investigation is now trying to find the most likely source of the outbreak, Defra said.
Chief Veterinary Officer Christine Middlemiss, said: "Bird keepers should remain alert for any signs of disease, report suspected disease immediately and ensure they are maintaining good biosecurity on their premises.
"We are urgently looking for any evidence of disease spread associated with this strain to control and eliminate it."
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