From 31 December, if a person is currently self-isolating as a positive case or a person tests positive for COVID-19 they must self-isolate for seven days.
O 31 Rhagfyr, os yw person yn hunanynysu fel achos positif ar hyn o bryd neu os yw person yn profi'n bositif am COVID-19, mae’n rhaid iddynt hunanynysu am saith diwrnod.