Mae'r newid yn golygu na fydd gofyn mwyach i bobl sydd wedi cael y brechlynnau hyn gymryd prawf cyn ymadael na phrawf PCR ar ddiwrnod 8, ac na fydd angen iddynt hunanynysu ar ôl cyrraedd Cymru.
The change means people who have had these vaccines will no longer be required to take a pre-departure test and day eight PCR test, or isolate after arriving in the Wales.