Cafodd y clefyd ei ddarganfod ar ôl cyhoeddi'r Parth Atal yng Nghymru ar 25 Ionawr, lle roed gofyn i geidwaid dofednod ac adar caeth eraill gymryd camau priodol ac ymarferol i rwystro'r clefyd rhag lledaenu.
The finding of the disease in this wild bird follows the introduction of a Prevention Zone in Wales on 25 January, which requires all keepers of poultry and other captive birds to take appropriate and practicable steps to prevent the spread of the disease.