The Bishop of St Albans received the following written answer on 6th December 2022:
The Lord Bishop of St Albans asked His Majesty’s Government how many of the poultry or other captive birds culled for avian influenza since the start of the outbreak on 27 October 2021 were free from infection at the time of culling.
Lord Benyon (Con): Not all birds on infected premises are tested. It is therefore not possible to estimate accurately the number of uninfected birds on the premises at the point of culling.
However, it should be noted that once introduced into the premises, avian influenza spreads rapidly through birds present. Following a report of suspicion of avian influenza, the National Reference Laboratory undertakes rigorous testing of a statistically valid sample of birds. All birds assessed as being part of the same epidemiological group on infected premises are humanely culled to stop the spread of the disease, and mitigate any public health risk these infected birds may pose.
The Church of England in Parliament 
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