Of the 1,840 close contacts that were eligible for follow-up, 87% were reached within 24 hours of being identified by a positive case.
O'r 1,840 o gysylltiadau agos a oedd yn gymwys ar gyfer camau dilynol, cyrhaeddwyd 87% ohonynt o fewn 24 awr o gael eu nodi gan achos positif.