| 19 October 2026 | H5N1 | Near Belford, North Northumberland (AIV 2026/21) | 32,000 free range layers | | | |
| 2 October 2026 | H5N5 | near Ness, Isle of Lewis (AIV 2026/20) | 10 Backyard Hens | | | |
| 17 April 2026 | H5N1 | fifth premises near Gainsborough, West Lindsey, Lincolnshire (AIV2026/19) | Breeding Ducks | | | |
| 14 April 2026 | H5N1 | fourth premises near Gainsborough, West Lindsey, Lincolnshire (AIV2026/17) | Breeding Ducks | | | |
| 14 April 2026 | H5N1 | near Great Shelford, South Cambridgeshire (AIV2026/18) | Pheasants | | | |
| 11 April 2026 | H5N1 | near Market Rasen, West Lindsey, Lincolnshire (AIV2026/16) | Breeding Ducks | | | |
| 4 March 2026 | H5N1 | near Omagh, County Tyrone | Pheasants | | | |
| 3 March 2026 | H5N1 | near Pickering, Thirsk and Malton, Yorkshire (AIV2026/15) | 22,000 Pheasants | | | |
| 14 February 2026 | H5N1 | near Ancroft, Northumberland, Northumberland (AIV 2026/14) | Backyard Flock | | | |
| 12 February 2026 | H5N1 | second near Penicuik, Midlothian (AIV 2026/13) | Backyard Flock | | | |
| 30 January 2026 | H5N1 | near Needham Market, Mid Suffolk, Suffolk (AIV 2026/12) | Backyard Flock | | | |
| 24 January 2026 | H5N1 | near Penicuik, Scottish Borders (AIV 2026/11) | 500,000 Free Range Layers | | | |
| 19 January 2026 | H5N1 | near Bacton, Mid Suffolk, Suffolk (AIV2026/09) | Backyard Flock | | | |
| 19 January 2026 | H5N1 | second premises near Bacton, Mid Suffolk, Suffolk (AIV2026/10) | 10,500 Duck Breeders | | | |
| 15 January 2026 | LPAI H5 | near Mundford, Breckland, Norfolk (AIV 2026/07) | Game Rearing Farm | | | |
| 15 January 2026 | H5N1 | third near York, North Yorkshire (AIV2026/08) | 140,000 Broilers | | | |
| 15 January 2026 | H5N1 | near Penicuik, Scottish Borders (AIV 2026/06) | 600,000 Free Range Layers | | | |
| 13 January 2026 | H5N1 | second near York, York, North Yorkshire (AIV2026/05) | 100,000 Laying Pullets | | | |
| 11 January 2026 | H5N1 | near Penicuik, Scottish Borders (AIV 2026/04) | 205,000Pullets | | | |
| 9 January 2026 | H5N1 | near Grassington, North Yorkshire, Yorkshire (AIV 2026/03) | Backyard Flock | | | |