A new case of highly pathogenic avian influenza (HPAI) H5N1 has been confirmed in a commercial duck meat flock near Brigg, North Lincolnshire.
A 3km Protection Zone (PZ) and 10km Surveillance Zone (SZ) were declared around the premises at 19:15 on 4 November, according to the Animal and Plant Health Agency (APHA).
The outbreak (AIV 2026/23) is the second confirmed case of H5N1 in a commercial poultry flock in England since the start of the current 2026-27 outbreak season on 1 October.
It follows confirmation of H5N1 in a commercial free-range laying flock near Belford, Northumberland, on 19 October, and a further case in a commercial free-range laying flock near Biggar, in the Scottish Borders, on 2 November.
A separate H5N5 outbreak was confirmed in a small backyard flock on the Isle of Lewis on 2 October.
The risk of HPAI H5 infection in wild birds in Great Britain remains at medium, while the risk to poultry is assessed as low where biosecurity is suboptimal or poor, and very low where good biosecurity is consistently maintained.
APHA has urged poultry keepers to maintain stringent biosecurity, including on mixed farms, and to monitor feed and water consumption closely as changes can indicate potential health problems.