Mae strategaeth frechu’r gaeaf yn erbyn feirysau anadlol wedi’i seilio ar y dystiolaeth a’r cyngor clinigol a gwyddonol diweddaraf gan y Cyd-bwyllgor ar Imiwneiddio a Brechu.
The winter respiratory vaccination strategy is guided by the latest clinical and scientific evidence and advice from the Joint Committee on Vaccination and Immunisation (JCVI).