Olrhain cysylltiadau a hunan ynysu / Contact tracing and self isolation

Isod mae llythyr am newid mewn trefniadau olrhain cysylltiadau a hunan-ynysu

Below is a letter regarding changes to contact tracing and self-isolation

Newidiadau olrhain cysylltiadau a hunan ynysu

Changes to contact tracing and self-isolation