These are our most vulnerable groups who would have the worst outcomes from catching the virus, along with care home staff and front line health and social care workers.
Dyma ein grwpiau mwyaf agored i niwed a fyddai'n cael y canlyniadau gwaethaf pe byddent yn dal y feirws, ynghyd â staff cartrefi gofal a gweithwyr iechyd a gofal cymdeithasol rheng flaen.