Yn ei gyngor terfynol, mae’r JCVI yn argymell y dylai unigolion a oedd yn gymwys ac a gafodd eu brechu yng Ngham 1 o’r rhaglen Frechu rhag COVID-19 (grwpiau blaenoriaeth 1-9) gael cynnig trydydd dos atgyfnerthu o frechlyn COVID-19. Bydd angen i o leiaf 6 mis fod wedi bod ers yr ail ddos. Argymhellir brechlyn mRNA (Pfizer-BioNTech neu Moderna) ni waeth pa frechlyn a roddwyd yn y prif ddos.
In their final advice, the JCVI recommends that individuals who were eligible and received vaccination in Phase 1 of the COVID-19 vaccination programme (priority groups 1-9) should be offered a third dose COVID-19 booster vaccine with a minimum 6-month interval after the 2nddose. An mRNA vaccine is recommended (Pfizer-BioNTech or Moderna) irrespective of which vaccine was given as a primary dose.