As we approach autumn and winter this year, we need to reflect carefully on the potential COVID vaccine booster programme, particularly among the priority groups.
Wrth i ni nesáu at yr hydref a'r gaeaf eleni, mae angen i ni fyfyrio'n ofalus ar y rhaglen pigiad atgyfnerthu posibl i frechlynnau COVID, yn enwedig ymhlith y grwpiau blaenoriaeth.