JCVI has recently advised that the evidence on vaccination effectiveness supports the case for moving the start of the adult flu vaccination programme to early October.
Mae JCVI wedi cynghori'n ddiweddar fod y dystiolaeth ar effeithiolrwydd brechu yn cefnogi'r achos dros symud dechrau'r rhaglen frechu ffliw ar gyfer oedolion i ddechrau mis Hydref.