Bydd ‘Exercise Blackthorn’ yn dynwared achos o Glwy’r Traed a'r Genau ar raddfa ganolig i raddfa fawr, sydd wedi lledaenu o Loegr i Gymru, yr Alban a Gogledd Iwerddon, yn ogystal ag o fewn Lloegr.
‘Exercise Blackthorn’ will stimulate a medium to large scale outbreak of Foot and Mouth Disease that has spread from England to Wales, Scotland and Northern Ireland as well as within England.