Thousands of people in Wales have serious health issues which makes coronavirus particularly risky for them – everyone can do their bit to reduce the spread of the virus.
Mae gan filoedd o bobl yng Nghymru broblemau iechyd difrifol sy’n gwneud coronafeirws yn beryglus iawn iddynt, ac felly mae’n rhaid i bawb wneud eu rhan er mwyn atal lledaeniad y feirws.