Of the 11,824 close contacts that were eligible for follow-up in all local authorities except Cardiff, 76% were reached within 24 hours of being identified by a positive case.
O'r 11,824 o gysylltiadau agos a oedd yn gymwys ar gyfer camau dilynol ym mhob awdurdod lleol heblaw Gaerdydd, cyrhaeddwyd 76% ohonynt o fewn 24 awr o gael eu nodi gan achos positif.