Bydd llythyrau sy'n gwahodd pobl ifanc 12 i 15 oed i gael un dos o'r brechlyn Pfizer yn dechrau cael eu hanfon at bobl yr wythnos nesaf a disgwylir y bydd y gwaith o roi’r brechlynnau cyntaf yn dechrau o 4 Hydref ymlaen.
Letters inviting 12 to 15-year-olds to have a single dose of the Pfizer vaccine will begin to be issued next week and the first vaccines are expected to be administered from 4 October.