Mae asesiad risg wedi'i gynnal gan filfeddygon ar gyfer Cymru a Lloegr sy'n dangos bod lefel y risg mewn adar gwyllt wedi cynyddu o Ganolig i Uchel. Mae'r risg y  caiff ei drosglwyddo'n uniongyrchol neu'n anuniongyrchol i ddofednod wedi codi hefyd, o Isel i Ganolig.  Fodd bynnag, mae'r risg i ddofednod yn dibynnu ar lefel y mesurau bioddiogelwch ar safleoedd unigol.
A veterinary risk assessment for England and Wales shows that the risk level for disease in wild birds has increased from Medium to High.  The risk associated with direct and indirect transmission to poultry has also increased from Low to Medium.  The risk to poultry, however, is dependent on the level of biosecurity at individual sites.