Mae mwy nag 1.5 miliwn o frechlynnau atgyfnerthu wedi'u rhoi hyd yma, gydag 81 y cant o bobl dros 50 oed wedi cael y dos atgyfnerthu.
More than 1.5 million boosters have been given to date, with 81 per cent of over 50s receiving the booster dose.