"Prif ffynhonnell yr haint i adar caeth yw adar y dŵr, a rhaid i'r mesurau bioddiogelwch ddiogelu'r mannau y mae adar domestig yn cael eu cadw rhag cael eu heintio, boed yn uniongyrchol neu'n anuniongyrchol.  Mae adar ysglyfaethus fel y boda yn cael eu heintio fwy na thebyg trwy fwyta adar dŵr heintiedig a dydyn nhw ddim yn debygol o gyfrannu at ei drosglwyddo. Dylech osgoi symud eich dofednod, a dylech wastad diheintio dillad ac offer cyn ac ar ôl eu defnyddio."
“The main source of infection to captive birds is wild waterfowl, and biosecurity measures must address both direct and indirect spread of infection to areas where domestic birds are kept.  Birds of prey such as buzzards are probably infected by eating affected waterfowl and are unlikely to play a role in transmission.  The movement of poultry should be minimised, and clothing and equipment should always be cleansed and disinfected before and after their use.”