Mae tri achos o'r clefyd wedi'u canfod yng Nghymru – yn y Waun, Crucywel a Gaerwen, Ynys Môn. Ond mae mwy na 70 yn y DU gyfan, sef y nifer uchaf ar gofnod, a dros 470 o achosion wedi cael eu canfod mewn adar gwyllt.
Three outbreaks of the disease have been found in Wales – in Chirk, Crickhowell and Gaerwen, Anglesey – but there are more than 70 in the UK as a whole, the highest number on record, and over 470 detections in wild birds.