We have been testing symptomatic individuals returning from travels since 29 January and we have been testing frontline NHS staff for COVID-19 since 7 March.
Rydym wedi bod yn profi unigolion symptomatig sydd wedi dychwelyd o deithiau tramor ers 29 Ionawr ac rydym wedi bod yn profi staff rheng flaen y GIG am COVID-19 ers 7 Mawrth.