Rhybuddiodd y Prif Weinidog yr wythnos ddiwethaf am storm yn ymgynnull o heintiau omicron ar ôl cyfnod y Nadolig wrth i rai mesurau cadarnach gael eu cyflwyno o 27 Rhagfyr ymlaen i ddiogelu bywydau a bywoliaethau.
The First Minister last week warned of a gathering storm of omicron infections after the Christmas period as some strengthened measures were introduced from 27 December to protect lives and livelihoods.