Mae byrddau iechyd yn gwahodd unigolion sydd wedi cael y dos cyntaf i gael ail ddos, ar yr amlder a ragnodir gan y cyngor clinigol. Bydd y dechneg fewngroenol i arbed dosau yn parhau i gael ei defnyddio ar gyfer y dos cyntaf a'r ail ddos, o ystyried nad oedd y cynllun peilot a gynhaliwyd ledled Cymru wedi codi unrhyw bryderon clinigol.
Health boards are inviting individuals who have received a first dose for a second dose, at the frequency prescribed by the clinical advice. The intradermal dose sparing technique will continue to be used for both first and second doses, given the pan-Wales pilot undertaken did not raise any clinical concerns.