Bird flu: premises near Wymondham, Diss, Norfolk (AIV 2025/33)

Highly pathogenic avian influenza (HPAI) H5N1 was confirmed in commercial poultry on 28 March 2025.

• From: Department for Environment, Food & Rural Affairs and Animal and Plant Health Agency
• Published: 28 March 2025
• Last updated: 25 April 2025 — See all updates

• Disease Type: Bird flu (avian influenza)
• Disease control zone restrictions: In force
• Disease control zone type: Surveillance zone
• Virus strain: H5N1
• Case opened date: 28 March 2025

Case information

25 April 2025

Following the successful completion of disease control activities and surveillance within the zone surrounding the premises near Wymondham, Diss, Norfolk (AIV 2025/33), the 3km protection zone has ended and the area that formed it becomes part of the 10km surveillance zone.

28 March 2025

Highly pathogenic avian influenza (HPAI) H5N1 was confirmed in commercial poultry at a near Wymondham, Diss, Norfolk (AIV 2025/33).

A 3km protection zone and 10km surveillance zone has been declared around the premises. All poultry on the premises will be humanely culled.

Declaration of the ending of a protection zone (PDF)

This revokes and replaces:

Declaration of an avian influenza protection zone and surveillance zone (PDF)

Further information

Check:

• the updated bird flu disease control zone map
• if you need a licence to move poultry, poultry by-products, eggs, material or mammals

Case number: AIV 2025/33

Published 28 March 2025

Last updated 25 April 2025 + show all updates

1. 25 April 2025

   Following the successful completion of disease control activities and surveillance within the zone surrounding the premises near Wymondham, Diss, Norfolk (AIV 2025/33), the 3km protection zone has ended and the area that formed it becomes part of the 10km surveillance zone.

2. 28 March 2025

   First published.