The latest results of the Office for National Statistics Coronavirus Infection Survey suggest an estimated one in 30 people were infected in the week ending 19 February.
Mae canlyniadau diweddaraf Arolwg Heintiadau Coronafeirws y Swyddfa Ystadegau Gwladol yn awgrymu bod un o bob 30 o bobl wedi cael eu heintio yn ystod yr wythnos a ddaeth i ben ar 19 Chwefror.