Mae pobl ledled Cymru yn cael eu hannog i aros nes eu bod yn cael eu gwahodd i gael eu brechlynnau atgyfnerthu ac i beidio â chysylltu â'r GIG na gwasanaethau iechyd i ofyn am frechlyn atgyfnerthu COVID-19.
People across Wales are being urged to wait until they are invited to have their booster and not to contact NHS or health services to request a Covid-19 booster vaccine.