Dechreuodd Bwrdd Iechyd Prifysgol Betsi Cadwaladr gynnig y brechlyn atgyfnerthu i'w staff ddyddiau'n unig ar ôl i'r Cyd-bwyllgor ar Imiwneiddio a Brechu (JCVI) gyhoeddi ei gyngor terfynol am raglen atgyfnerthu'r hydref.
Betsi Cadwaladr University Health Board began to offer its staff the booster vaccine just days after the Joint Committee on Vaccination and Immunisation (JCVI) issued its final advice about the autumn booster programme.