The primary aim of the Covid-19 vaccination programme is to boost immunity in those at higher risk from Covid-19 and to improve protection against severe illness, hospitalisation and death.
Prif nod y rhaglen brechu yn erbyn COVID-19 yw hybu imiwnedd yn y rhai sy'n wynebu risg uwch o ganlyniad i COVID-19, a gwella amddiffyniad rhag salwch difrifol, mynd i'r ysbyty a marwolaeth.