A virus closely related to the H5N6 avian flu strain led the Department for Environment, Food and Rural Affairs (Defra) to declare a prevention zone around the affected area - near the village of Abbotsbury.
It is the first bird flu finding this winter.
Defra insisted the strain was not a food safety risk for shoppers, and Public Health England said the risk to people’s health was “very low”.
Defra’s chief veterinary officer, Nigel Gibbens, said: “This is the first time avian flu has been identified in the UK this winter and while the disease does not represent a threat to the public, it is highly infectious and deadly to birds.
“As the virus has been circulating across Europe, this finding has not come as a surprise.
“But it is vital that anyone who keeps birds – whether a few in a back garden or thousands on a farm – is vigilant for any signs of disease, reports suspect disease to the Animal and Plant Health Agency and maintains good biosecurity to reduce the risk of their birds becoming infected.”
Defra said that inside the prevention zone keepers of captive birds will be made to feed and water their animals indoors, and disinfect their footwear.
No culls are planned, the department added.
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