Mae’n bwysig bod y rheini sy’n gymwys yn unol â chyngor y JCVI yn cael dos atgyfnerthu’r brechlyn COVID-19 pan cânt eu galw i gael apwyntiad, gan fod posibilrwydd bod imiwnedd eu dosau blaenorol yn lleihau dros amser.
It is important that those eligible under the JCVI advice receive a booster dose of the COVID-19 vaccine, when they are called for an appointment, as there is the possibility of reduced immunity of their previous doses over time.