The winter respiratory vaccination programme (WRVP) commenced on 1 September 2022 and ran until 31 March 2023.
Dechreuwyd rhoi Rhaglen Frechu’r Gaeaf yn erbyn Feirysau Anadlol ar waith ar 1 Medi 2022 a rhedodd y rhaglen honno tan 31 Mawrth 2023.