Bydd pob un yng ngrwpiau blaenoriaeth 1-9 y Cyd-bwyllgor ar Imiwneiddio a Brechu (JCVI) yn cael eu gwahodd i gael brechiad atgyfnerthu o leiaf chwe mis wedi iddynt gael eu dos diwethaf. Fel o'r blaen, bydd y llythyrau yn cael eu hanfon yn uniongyrchol gan y byrddau iechyd a gofynnir i bobl beidio â chysylltu â'u meddyg teulu.
Everyone in the Joint Committee on Vaccination and Immunisation (JCVI)’s 1-9 priority groups will be invited for a booster vaccination when it has been at least six months since their last dose. As before, invitation letters will be sent directly from health boards and people are requested not to contact their GP.