In Wales, it is estimated that around 7,000 deaths and 10,000 hospital admissions have been prevented as a result of the vaccination programme.
Yng Nghymru, amcangyfrifir bod tua 7,000 o farwolaethau a 10,000 o dderbyniadau i’r ysbyty wedi’u hatal o ganlyniad i’r rhaglen frechu.