On 3 December, the Welsh Government introduced Omicron-specific regulations to require any contacts of suspected or confirmed Omicron cases to self-isolate.
Ar 3 Rhagfyr, cyflwynodd Llywodraeth Cymru reoliadau i fynnu bod cysylltiadau agos achosion Omicron, tybiedig neu a gadarnhawyd, yn hunanynysu.