Mae'r data diweddaraf yn dangos bod acchosion o'r ffliw, COVID-19 a firysau anadlol tymhorol eraill wedi cynyddu dros gyfnod y Nadolig ac yn parhau i fod ar lefelau uchel iawn.
The latest data shows the prevalence of flu, COVID-19 and other seasonal respiratory viruses has increased over the Christmas period and remains at very high levels.