Mae cyngor sydd bellach wedi dod i law gan y Gyd-ganolfan Bioddiogelwch yn dangos ei bod yn anodd asesu'n llawn y risg sy’n codi i iechyd y cyhoedd yn sgil nifer yr achosion o amrywiolion y coronafeirws a'u lledaeniad. Ar sail y cyngor hwn, ac er mwyn cymryd ymagwedd gyffredin ar draws y pedair gwlad mewn perthynas â theithio rhyngwladol, rwyf wedi penderfynu bod angen cyflwyno mesurau ychwanegol i reoli'r risgiau hynny.
Advice which has now been received from the Joint Biosecurity Centre indicates that it is difficult to fully assess the public health risk posed by the incidence and spread of variant strains of coronavirus.  On the basis of this advice and with a view to taking a four nations approach in relation to international travel, I have decided that enhanced measures need to be introduced to manage those risks.