Byddwn i’n annog pawb sy'n gymwys i gael brechlyn atgyfnerthu fanteisio ar y cynnig pan fyddan nhw’n cael eu galw am apwyntiad, gan fod posibilrwydd y bydd imiwnedd o'u dosau cynharach o'r brechlyn yn lleihau wrth i amser fynd heibio.
I would urge all those who are eligible for a booster take up the offer when they are called for an appointment, as there is the possibility of reduced immunity from their earlier doses of the vaccine as time passes.