Research and analysis
Avian influenza in wild birds: 2021
Updated 16 December 2024
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| Week number | Location | Number of findings | Species involved | Total number of birds testing positive |
|---|---|---|---|---|
| Week 1 (2021) | Lancashire | 1 | Pink footed goose | 1 |
| Week 1 (2021) | County Durham | 1 | Canada goose | 1 |
| Week 1 (2021) | Western Isles | 1 | Mute swan | 1 |
| Week 1 (2021) | Warwickshire | 1 | Mute Swan | 1 |
| Week 2 (2021) | Devon | 1 | Mute swan | 3 |
| Week 2 (2021) | Yorkshire | 1 | Common Buzzard | 1 |
| Week 3 (2021) | Moray | 1 | Knot | 1 |
| Week 3 (2021) | Aberdeenshire | 1 | Red Knot | 2 |
| Week 3 (2021) | Lincolnshire | 1 | Red Kite | 1 |
| Week 4 (2021) | Devon | 1 | Mute swan | 3 |
| Week 4 (2021) | Cornwall | 1 | Mute swan | 2 |
| Week 4 (2021) | East Lothian | 1 | Mute swan | 2 |
| Week 5 (2021) | Cambridgeshire | 1 | Buzzard | 1 |
| Week 5 (2021) | Lancashire | 1 | Peregrine Falcon | 1 |
| Week 6 (2021) | Not applicable | 0 | No positive birds reported | 0 |
| Week 7 (2021) | Not applicable | 0 | No positive birds reported | 0 |
| Week 8 (2021) | Not applicable | 0 | No positive birds reported | 0 |
| Week 9 (2021) | Not applicable | 0 | No positive birds reported | 0 |
| Week 10 (2021) | West Yorkshire | 1 | Red Kite | 1 |
| Week 11 (2021) | Not applicable | 0 | No positive birds reported | 0 |
| Week 12 (2021) | Not applicable | 0 | No positive birds reported | 0 |
| Week 13 (2021) | Not applicable | 0 | No positive birds reported | 0 |
| Week 14 (2021) | Not applicable | 0 | No positive birds reported | 0 |
| Week 15 (2021) | Staffordshire | 1 | Pheasant | 6 |
| Week 15 (2021) | Fife, Scotland | 1 | Rook | 3 |
| Week 16 (2021) | Not applicable | 0 | No positive birds reported | 0 |
| Week 17 (2021) | Not applicable | 0 | No positive birds reported | 0 |
| Week 18 (2021) | Not applicable | 0 | No positive birds reported | 0 |
| Week 19 (2021) | Not applicable | 0 | No positive birds reported | 0 |
| Week 20 (2021) | Not applicable | 0 | No positive birds reported | 0 |
| Week 21 (2021) | Not applicable | 0 | No positive birds reported | 0 |
| Week 22 (2021) | Not applicable | 0 | No positive birds reported | 0 |
| Week 23 (2021) | Not applicable | 0 | No positive birds reported | 0 |
| Week 24 (2021) | Not applicable | 0 | No positive birds reported | 0 |
| Week 25 (2021) | Not applicable | 0 | No positive birds reported | 0 |
| Week 26 (2021) | Not applicable | 0 | No positive birds reported | 0 |
| Week 27 (2021) | Not applicable | 0 | No positive birds reported | 0 |
| Week 28 (2021) | Not applicable | 0 | No positive birds reported | 0 |
| Week 29 (2021) | Not applicable | 0 | No positive birds reported | 0 |
| Week 30 (2021) | Shetland, Scotland | 1 | Great Skua | 3 |
| Week 31 (2021) | Not applicable | 0 | No positive birds reported | 0 |
| Week 32 (2021) | Flannan Isles, Outer Hebrides, Scotland | 1 | Great Skua | 1 |
| Week 33 (2021) | St Kilda, Outer Hebrides, Scotland | 1 | Great Skua | 3 |
| Week 34 (2021) | Not applicable | 0 | No positive birds reported | 0 |
| Week 35 (2021) | Not applicable | 0 | No positive birds reported | 0 |
| Week 36 (2021) | Not applicable | 0 | No positive birds reported | 0 |
| Week 37 (2021) | Not applicable | 0 | No positive birds reported | 0 |
| Week 38 (2021) | Not applicable | 0 | No positive birds reported | 0 |
| Week 39 (2021) | Not applicable | 0 | No positive birds reported | 0 |
| Week 40 (2021) | Not applicable | 0 | No positive birds reported | 0 |
| Week 41 (2021) | Not applicable | 0 | No positive birds reported | 0 |
| Week 42 (2021) | Not applicable | 0 | No positive birds reported | 0 |
| Week 43 | (Wrexham, Wales) | 1 | Pheasant | 5 |
| Week 43 | (Preston, Lancashire) | 1 | Curlew | 1 |
| Week 43 | (Kirkaldy, Fife, Scotland) | 1 | Unspecified gull | 1 |
| Week 43 | (Edinburgh, Scotland) | 1 | Mute swan | 1 |
| Week 43 | (Lancashire | 1 | Whooper swan | 1 |
| Week 43 | (Lancashire) | 1 | Greylag goose | 1 |
| Week 44 (2021) | (Worcestershire) | 2 | Mute swan | 4 |
| Week 44 (2021) | (Lancashire) | 2 | Whooper swan | 2 |
| Week 44 (2021) | (Lancashire) | 1 | Pink-footed goose | 1 |
| Week 44 (2021) | (Warwickshire) | 1 | Canada goose | 1 |
| Week 44 (2021) | (Warwickshire) | 2 | Mute swan | 4 |
| Week 44 (2021) | (Norfolk) | 1 | Mute swan | 1 |
| Week 44 (2021) | (North Yorkshire) | 1 | Mute swan | 1 |
| Week 44 (2021) | (Lancashire) | 1 | Greylag goose | 2 |
| Week 44 (2021) | (Carmarthenshire, Wales) | 1 | Herring gull | 1 |
| Week 45 (2021) | Lancashire | 1 | Whooper Swan, Greylag goose | 3 |
| Week 45 (2021) | Stratford-on-Avon District Council | 3 | Mute swans; unspecified geese, common buzzard | 33 |
| Week 45 (2021) | Richmondshire | 1 | Common buzzard, wild pheasant | 6 |
| Week 45 (2021) | Bury | 1 | Great crested grebe | 1 |
| Week 45 (2021) | Ceredigion | 1 | Canada geese | 2 |
| Week 45 (2021) | City of Carlisle | 1 | Barnacle goose | 1 |
| Week 45 (2021) | East Riding of Yorkshire | 1 | Peregrine falcon | 2 |
| Week 45 (2021) | Pewsey, Wilts | 1 | Mute swan | 1 |
| Week 45 (2021) | Tewkesbury Borough | 1 | Mute swan | 1 |
| Week 45 (2021) | Wokingham Borough | 1 | Mute swan | 1 |
| Week 45 (2021) | Malvern Hills District Council | 1 | Mute swan | 3 |
| Week 45 (2021) | West Lancashire Borough | 2 | Greylag goose, whooper swan, pink footed goose, mallard duck | 1 |
| Week 45 (2021) | Borough Council of Kings Lynn and West Norfolk | 1 | Whooper swan | 7 |
| Week 46 (2021) | Fylde Borough Council | 1 | Mute Swan | 2 |
| Week 46 (2021) | Arun District Council | 1 | Mute Swan | 1 |
| Week 46 (2021) | Lichfield | 1 | Mute Swan | 2 |
| Week 46 (2021) | Dumfries and Galloway | 1 | Whooper swan | 1 |
| Week 46 (2021) | Fife | 1 | Common buzzard | 1 |
| Week 46 (2021) | Powys | 1 | Mute Swan | 1 |
| Week 46 (2021) | Sefton Metropolitan Borough Council | 1 | Pink-footed goose | 3 |
| Week 46 (2021) | Lancaster City Council | 1 | Mute Swan | 1 |
| Week 46 (2021) | Lancaster City Council | 1 | Mallard duck | 1 |
| Week 46 (2021) | South Lakeland District Council | 1 | Mute Swan | 2 |
| Week 46 (2021) | Dumfries and Galloway | 1 | Barnacle goose | 1 |
| Week 46 (2021) | Fylde Borough Council | 1 | Mute Swan | 1 |
| Week 46 (2021) | Bury Metropolitan Borough Council | 1 | Canada goose | 1 |
| Week 46 (2021) | West Lancashire Borough Council | 1 | Canada goose, curlew | 2 |
| Week 46 (2021) | Stockport Metropolitan Borough Council | 1 | Canada goose | 2 |
| Week 46 (2021) | Fylde Borough Council | 1 | Mute swans | 2 |
| Week 46 (2021) | Blackpool Borough Council | 1 | Mute swans | 2 |
| Week 46 (2021) | Rushcliffe Borough Council | 1 | Mute swan | 1 |
| Week 46 (2021) | Borough Council of Kings Lynn and West Norfolk | 1 | Pink footed goose | 1 |
| Week 46 (2021) | Craven District Council | 1 | Canada goose | 1 |
| Week 46 (2021) | Northumberland | 1 | Barnacle goose, mute swan | 2 |
| Week 46 (2021) | Northumberland | 1 | Greylag goose | 1 |
| Week 46 (2021) | Stockton-on-Tees Borough Council | 1 | Barnacle goose | 1 |
| Week 46 (2021) | Bury Metropolitan Borough Council | 1 | Mute swan | 1 |
| Week 46 (2021) | Lichfield District Council | 1 | Mute swan | 2 |
| Week 46 (2021) | Stroud District Council | 1 | Mute swan | 1 |
| Week 46 (2021) | Dumfries and Galloway | 1 | Whooper swan | 1 |
| Week 46 (2021) | Perth and Kinross Council | 1 | Unspecified duck | 1 |
| Week 46 (2021) | Walsall Metropolitan Borough Council | 1 | Mute swans | 2 |
| Week 47 (2021) | Sefton Metropolitan Borough Council | 1 | Pink footed goose; Canada goose | 3 |
| Week 47 (2021) | West Lancashire Borough | 1 | Whooper swan | 1 |
| Week 47 (2021) | Bury Metropolitan Borough Council | 1 | Canada goose | 2 |
| Week 47 (2021) | Dumfriesshire | 1 | Barnacle goose, kestrel, Whooper swan | 3 |
| Week 47 (2021) | Rushcliffe Borough Council | 1 | swan | 1 |
| Week 47 (2021) | Stroud District Council | 1 | mute swans | 2 |
| Week 47 (2021) | South Ribble Borough Council | 1 | widgeon | 1 |
| Week 47 (2021) | Wyre Council | 1 | Mute swan | 1 |
| Week 47 (2021) | Fylde Borough Council | 1 | Mute swan | 1 |
| Week 47 (2021) | Melton Borough Council | 1 | Swan | 1 |
| Week 47 (2021) | Charnwood Borough Council | 1 | Swan | 1 |
| Week 47 (2021) | East Suffolk District Council | 1 | Swans | 2 |
| Week 47 (2021) | Sedgefield | 1 | Swan, Canada goose | 2 |
| Week 47 (2021) | Dumfriesshire | 1 | Pink Footed Goose | 1 |
| Week 47 (2021) | Dumfriesshire | 1 | Greylag goose | 1 |
| Week 47 (2021) | Dumfriesshire | 1 | Barnacle Goose | 1 |
| Week 47 (2021) | Fife | 1 | Mute swan | 2 |
| Week 47 (2021) | Angus | 1 | Greylag goose | 2 |
| Week 47 (2021) | Highland | 1 | Sea eagle | 1 |
| Week 47 (2021) | Dorset | 1 | Mute swans | 4 |
| Week 47 (2021) | Walsall Metropolitan Borough Council | 1 | Mute swans | 2 |
| Week 47 (2021) | Lichfield District Council | 1 | Mute swan, black headed gull | 2 |
| Week 47 (2021) | Lancaster City Council | 1 | Mute swan | 1 |
| Week 47 (2021) | South Lakeland District Council | 1 | Mute swan | 4 |
| Week 47 (2021) | Rother District Council | 1 | Greylag goose | 1 |
| Week 47 (2021) | North Northamptonshire | 1 | Mute swan | 2 |
| Week 47 (2021) | West Northamptonshire | 1 | Mute swan | 1 |
| Week 47 (2021) | Sandwell Metropolitan Borough Council | 1 | Canada goose | 1 |
| Week 47 (2021) | Walsall Metropolitan Borough Council | 1 | Mute swan | 1 |
| Week 47 (2021) | Aberdeenshire | 1 | Unspecified goose | 1 |
| Week 47 (2021) | Craven District Council | 1 | Mute swan | 1 |
| Week 47 (2021) | Cheshire East | 1 | Mute swan, Canada geese | 7 |
| Week 47 (2021) | Herefordshire | 1 | Mute swan | 1 |
| Week 47 (2021) | Blackpool Borough Council | 1 | Mute swans | 2 |
| Week 48 (2021) | Dumfries and Galloway | 1 | Unspecified goose | 2 |
| Week 48 (2021) | Dumfriesshire | 1 | Barnacle goose | 2 |
| Week 48 (2021) | Peterborough City Council | 1 | Greylag goose | 1 |
| Week 48 (2021) | South Cambridgeshire District Council | 1 | Mute swan | 1 |
| Week 48 (2021) | West Lancashire Borough | 1 | Mute swan | 1 |
| Week 48 (2021) | Leeds City Council | 1 | Common buzzard | 1 |
| Week 48 (2021) | Wokingham | 1 | Mute swan | 1 |
| Week 48 (2021) | Stratford-on-Avon District Council | 1 | Canada goose, mute swan | 7 |
| Week 48 (2021) | City of Carlisle | 1 | Barnacle goose | 1 |
| Week 48 (2021) | Dumfriesshire | 1 | Whooper swan; unidentified swan | 2 |
| Week 48 (2021) | South Lanarkshire | 1 | Unspecified goose | 1 |
| Week 48 (2021) | Falkirk | 1 | Swan | 1 |
| Week 48 (2021) | Dumfriesshire | 1 | Barnacle goose | 1 |
| Week 48 (2021) | Dumfries and Galloway | 1 | Barnacle goose | 1 |
| Week 48 (2021) | Dumfriesshire | 1 | Barnacle goose | 1 |
| Week 48 (2021) | Stroud | 1 | Mute swans | 5 |
| Week 48 (2021) | Scottish Borders | 1 | Mute swan | 1 |
| Week 48 (2021) | Fylde Borough Council | 1 | Mute swan | 1 |
| Week 48 (2021) | Sefton Metropolitan Borough Council | 1 | Mute swan | 3 |
| Week 48 (2021) | Fylde Borough Council | 1 | Mute swan | 3 |
| Week 48 (2021) | Carlisle City Council | 2 | Barnacle goose | 2 |
| Week 48 (2021) | Allerdale Borough Council | 1 | Barnacle goose | 1 |
| Week 48 (2021) | South Norfolk District Council | 1 | Mute swan | 1 |
| Week 48 (2021) | North Norfolk District Council | 1 | Mute swan | 1 |
| Week 48 (2021) | North Norfolk District Council | 1 | Mute swan | 2 |
| Week 48 (2021) | Chelmsford City Council | 1 | Mute swan, greylag goose | 2 |
| Week 48 (2021) | West Northamptonshire | 1 | Mute swan | 1 |
| Week 48 (2021) | Sunderland City Council | 1 | Mute swan | 6 |
| Week 48 (2021) | Stockton-on-Tees Borough Council | 1 | Mute swan; swan | 3 |
| Week 48 (2021) | Hartlepool Borough Council | 1 | Goose | 1 |
| Week 48 (2021) | Harrogate | 1 | Canada goose; greylag goose | 2 |
| Week 48 (2021) | Cheddar | 1 | Common buzzard | 1 |
| Week 48 (2021) | Dorset | 1 | Mute swan | 1 |
| Week 48 (2021) | Dorset | 1 | Canada goose | 1 |
| Week 48 (2021) | Anglesey | 1 | Mute swan | 1 |
| Week 48 (2021) | Shropshire | 1 | Canada goose | 2 |
| Week 48 (2021) | Bury | 1 | Canada goose | 1 |
| Week 48 (2021) | Gwynedd Council | 1 | Common buzzard | 1 |
| Week 48 (2021) | Dumfries and Galloway | 1 | Canada goose | 1 |
| Week 48 (2021) | Stroud | 1 | Mute swan, greylag goose | 4 |
| Week 49 (2021) | Allerdale Borough Council | 2 | Mute Swan,Barnacle Goose | 3 |
| Week 49 (2021) | Dumfries and Galloway | 5 | Common Buzzard, Greylag goose, Mute Swan, Barnacle Goose | 5 |
| Week 49 (2021) | West Berkshire Council | 1 | Mute Swan | 3 |
| Week 49 (2021) | Wokingham | 1 | Mute Swan | 1 |
| Week 49 (2021) | Lewes | 1 | Greylag goose | 1 |
| Week 49 (2021) | Chelmsford | 1 | Unidentified Swan | 1 |
| Week 49 (2021) | South Oxfordshire | 1 | Kestrel | 1 |
| Week 49 (2021) | Gedling Borough | 1 | Mute Swan | 1 |
| Week 49 (2021) | Durham | 3 | Unspecified Goose,Greylag goose,Unidentified Swan. | 3 |
| Week 49 (2021) | Teignbridge | 1 | Black Swan | 1 |
| Week 49 (2021) | Walsall Metropolitan Borough Council | 1 | Unspecified Goose | 2 |
| Week 49 (2021) | Eden | 1 | Mute Swan | 1 |
| Week 49 (2021) | Cheshire East | 1 | Common Buzzard | 1 |
| Week 49 (2021) | Shropshire | 1 | Unspecified Goose | 1 |
| Week 49 (2021) | Halton Borough | 1 | Mute Swan | 1 |
| Week 49 (2021) | Sunderland City Council | 2 | Black headed gull | 2 |
| Week 49 (2021) | Angus | 1 | Unidentified Swan | 1 |
| Week 49 (2021) | West Lancashire Borough | 2 | Whooper Swan, Greylag goose | 3 |
| Week 49 (2021) | Scottish Borders | 1 | Mute Swan | 1 |
| Week 49 (2021) | North Northamptonshire | 1 | Mute Swan | 1 |
| Week 49 (2021) | East Riding of Yorkshire | 1 | Greylag goose | 1 |
| Week 49 (2021) | Leeds City Council | 1 | Greylag goose | 1 |
| Week 49 (2021) | Dorset | 1 | Mute Swan | 1 |
| Week 49 (2021) | Stroud | 3 | Mute Swan, Greylag goose | 4 |
| Week 49 (2021) | West Lancashire Borough | 3 | Whooper Swan, Lapwing | 3 |
| Week 50 (2021) | Allerdale Borough Council | 2 | Barnacle Goose | 2 |
| Week 50 (2021) | South Lakeland District Council | 1 | Pheasant | 2 |
| Week 50 (2021) | Harrogate | 2 | Mute Swan | 2 |
| Week 50 (2021) | Ryedale District Council | 1 | Sparrowhawk | 1 |
| Week 50 (2021) | Dorset | 3 | Canada Goose, Mute Swan, Black Swan | 4 |
| Week 50 (2021) | City of Wolverhampton Council | 2 | Mute Swan, Canada Goose | 4 |
| Week 50 (2021) | Dumfries and Galloway | 8 | Common Buzzard, Barnacle Goose, Canada Goose, Mute Swan | 8 |
| Week 50 (2021) | West Lancashire Borough | 2 | Grey Heron, Whooper Swan | 2 |
| Week 50 (2021) | South Lanarkshire | 1 | Mute Swan | 1 |
| Week 50 (2021) | Stroud | 2 | Bewick's Swan, Greylag Goose | 2 |
| Week 50 (2021) | Leeds City Council | 1 | Mute Swan | 1 |
| Week 50 (2021) | Shropshire | 1 | Mute Swan | 2 |
| Week 50 (2021) | Wigan Metropolitan Borough | 1 | Canada Goose | 2 |
| Week 50 (2021) | Scottish Borders | 1 | Common Buzzard | 1 |
| Week 50 (2021) | Mendip District Council | 1 | Common Buzzard | 1 |
| Week 50 (2021) | Borough Council of Kings Lynn and West Norfolk | 1 | Whooper Swan | 2 |
| Week 50 (2021) | Dumfriesshire | 4 | Barnacle Goose, Whooper Swan | 4 |
| Week 50 (2021) | Highland | 1 | Common Buzzard | 1 |
| Week 51 (2021) | Sunderland City Council | 3 | Mute Swan, Canada Goose, Kestrel | 3 |
| Week 51 (2021) | East Riding of Yorkshire | 1 | Peregrine Falcon | 1 |
| Week 51 (2021) | Dorset | 3 | Mute Swan, Canada Goose Greylag Goose | 17 |
| Week 51 (2021) | West Lancashire Borough | 1 | Black headed gull | 1 |
| Week 51 (2021) | Dumfries and Galloway | 1 | Common Buzzard | 1 |
| Week 51 (2021) | Aberdeenshire | 1 | Unidentified Swan | 1 |
| Week 51 (2021) | Newcastle City Council | 1 | Unspecified Duck | 1 |
| Week 51 (2021) | County Durham | 1 | Common Buzzard | 1 |
| Week 51 (2021) | Breckland | 1 | Common Buzzard | 1 |
| Week 51 (2021) | North Norfolk District Council | 1 | Mute Swan | 1 |
| Week 51 (2021) | Carlisle City Council | 1 | Common Buzzard | 1 |
| Week 51 (2021) | Dumfries and Galloway | 2 | Barnacle Goose | 3 |
| Week 51 (2021) | Walsall Metropolitan Borough Council | 2 | Canada Goose | 3 |
| Week 51 (2021) | Sandwell Metropolitan Borough Council | 1 | Canada Goose | 3 |
| Week 51 (2021) | Cheshire East | 1 | Canada Goose | 2 |
| Week 51 (2021) | Borough Council of Kings Lynn and West Norfolk | 1 | Whooper Swan | 1 |
| Week 52 (2021) | Melton Borough Council | 1 | Sparrowhawk | 1 |
| Week 52 (2021) | South Tyneside | 2 | Mute Swan | 3 |
| Week 52 (2021) | South Lanarkshire | 1 | Mute Swan | 1 |
| Week 52 (2021) | Dumfriesshire | 5 | Barnacle Goose, Whooper Swan, Gull, Common Buzzard, Mute Swan | 9 |
| Week 52 (2021) | Dumfries and Galloway | 2 | Unidentified Swan, Barnacke Goose | 2 |
| Week 52 (2021) | South Lanarkshire | 1 | Sparrowhawk | 1 |
| Week 52 (2021) | North Somerset | 1 | Mute Swan | 1 |
| Week 52 (2021) | Aberdeenshire | 2 | Unidentified Swan, Unidentified Duck | 2 |
| Week 52 (2021) | Warrington | 1 | Mute Swan | 1 |
| Week 52 (2021) | St Helens | 2 | Great-crested Grebe, Canada Goose | 3 |
| Week 52 (2021) | City of Wolverhampton Council | 1 | Canada Goose | 2 |
| Week 52 (2021) | Glasgow City | 1 | Unidentified Swan | 1 |
| Week 52 (2021) | Stockport Metropolitan Borough Council | 1 | Black headed Gull | 1 |
| Week 52 (2021) | Scottish Borders | 2 | Common Buzzard, Greylag Goose | 2 |
| Week 52 (2021) | Stroud | 1 | Greylag Goose | 1 |
| Week 52 (2021) | Midlothian | 1 | Mute Swan | 1 |