Data included in this release between 27 December 2020 and 2 January 2021 was extracted from the contact tracing system at 10:00 on 5 January 2021.
Cafodd y data yn y datganiad hwn rhwng 27 Rhagfyr 2020 a 2 Ionawr 2021 ei dynnu o’r system olrhain cysylltiadau am 10:00 ar 5 Ionawr 2021.