Mae Llywodraeth Cymru, fel gwledydd eraill y DU, yn dilyn cyngor y Cyd-bwyllgor ar Imiwneiddio a Brechu sydd, ers mis Rhagfyr 2020, wedi argymell mai dim ond pobl ag  asthma difrifol sy’n wynebu risg uwch o ganlyniad i COVID-19. Nid yw unigolion ag asthma ysgafn i gymedrol yn wynebu risg uwch o ganlyniadau difrifol o ganlyniad i COVID-19 ac nid yw’r Cyd-bwyllgor ar Imiwneiddio a Brechu yn argymell y dylent gael y brechlyn ar hyn o bryd.
The Welsh Government, like the other UK nations, is following the advice of the JCVI who, since December 2020, has recommended that only those with severe asthma are at increased risk from COVID-19. Individuals with mild to moderate asthma are not at increased risk of severe outcomes with COVID-19 and not recommended for vaccination at this time by JCVI.