As of week commencing 15 February, NHS Wales has effectively begun operating two sets of arrangements alongside each other – that’s a first dose system and a second dose system.
Ers wythnos 15 Chwefror, mae GIG Cymru yn y bôn wedi dechrau gweithredu dwy set o drefniadau ochr yn ochr – system ddos gyntaf a system ail ddos.