Avian flu cases have continued to emerge in England just days after mandatory housing measures were lifted, underlining the ongoing risk to poultry farms despite the easing of restrictions. On17 April Defra confirmed highly pathogenic avian influenza (HPAI) H5N1 was confirmed in a fourth large commercial poultry unit near Gainsborough, West Lindsey, Lincolnshire. This follows earlier confirmations on 14 April, when the disease was found at a third premises near Gainsborough and also near Great Shelford, South Cambridgeshire, Cambridgeshire, and on 11 April at a site near Market Rasen in Lincolnshire. In each case, authorities confirmed that a 3km protection…