Nearly 20,000 turkeys are to be culled following the discovery of H5N8 avian flu at a commercial rearing unit in Frithville, near Boston, Lincolnshire.
It is the third case of avian flu affecting poultry farms in Lincolnshire since the first outbreak was confirmed in mid-December and the 6th in total. The first 2 cases in Lincolnshire were not thought to be linked.
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It follows confirmation of an outbreak in 10,000 farmed breeding pheasants in Wyre, Lancashire earlier this week.
Defra announced it had placed a 3km Protection Zone and a 10km Surveillance Zone around the infected premises to limit the risk of the disease spreading.
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It said a number of the turkeys had died from the disease and the remaining live birds would be humanely culled.
A full investigation is underway to determine the source of the infection, Defra added.
Restrictions remain in place around all but the initial outbreak location in Louth.