Mae Syr Frank yn rhybuddio ei bod yn hanfodol bod y nifer sy'n manteisio ar gwrs llawn (2 ddos) o'r brechlyn MMR yn cynyddu i 95%, y targed a osodwyd gan Sefydliad Iechyd y Byd, i amddiffyn cymunedau Cymru rhag brigiad o achosion a all gael effaith aruthrol.
Sir Frank is warning that it is essential that uptake of a full course (2 doses) of the MMR vaccine is increased to 95%, the target set by the World Health Organisation, to protect Welsh communities from a potentially devastating outbreak.