of the 698,595 close contacts that were eligible for follow-up, 635,305 (90.9%) were successfully contacted and advised accordingly, or had their case otherwise resolved
o blith y 698,595 o gysylltiadau agos a oedd yn gymwys i'w holrhain, cysylltwyd a chynghorwyd â 635,305 (90.9%) yn llwyddiannus, neu chafwyd eu hachos ei ddatrys yn syth