All birds on the farm in Gayton, close to King’s Lynn, are to be “humanely culled” following the invention of the an infection on Sunday.
A 3km safety zone and 10km surveillance zone has additionally been put in place across the premises, the Animal and Plant Well being Company has mentioned.
Avian flu primarily impacts birds however can, in uncommon instances, additionally have an effect on people and different animals.
The case present in Norfolk is essentially the most critical kind of avian flu – extremely pathogenic avian influenza (HPAI) – which is usually deadly to birds.
The invention comes days after one other case of the illness was confirmed on Friday, amongst captive wild birds at a premises close to Newlyn, St. Ives, Cornwall.
In November, it was declared there was a medium threat of avian flu for some poultry premises within the UK, and enhanced measures had been launched to curb the unfold of an infection.
The danger has just lately been lowered to low, however all poultry gatherings, together with at gala’s and markets, stay banned.
The RSPB is looking for the federal government “to develop a response plan urgently” to scale back the affect on the nation’s chook populations.
The charity says: “We wish to see coordinated surveillance and testing of untamed and home birds, carcasses to be safely disposed of and weak chook populations protected. We additionally need measures put in place to cease the pointless disturbance of untamed birds affected by the virus.
“In the long run, we would like a lot larger significance being given to prioritising and funding seabird conservation. This is able to assist make our seabird populations extra resilient to those illnesses and the opposite challenges they face.”