Now more than ever, with the threat of this new variant, it is important that people come forward for their appointments when called, especially those who have yet to take up their first dose.
Mae'r system mewn perygl o fynd yn fwy tameidiog gyda bylchau'n dod i'r amlwg, yn enwedig i'r rhai sydd ymhellach o'r farchnad lafur a oedd eisoes dan anfantais cyn y pandemig.