Nid oes gan tua 1 o bob 3 o bobl sydd â coronafeirws symptomau ond gallant ddal i heintio eraill, sy'n golygu bod profion asymptomatig yn ffordd bwysig o gadw pobl yn ddiogel wrth i gyfyngiadau gael eu lleddfu'n raddol.
About 1 in 3 people with coronavirus do not have symptoms but can still infect others, which means asymptomatic testing is an important means to keep people safe as restrictions are gradually eased.