Of the 5,314 close contacts that were eligible for follow-up, 69% were reached within 24 hours of being identified by a positive case.
O'r 5,314 o gysylltiadau agos a oedd yn gymwys ar gyfer camau dilynol, cyrhaeddwyd 69% ohonynt o fewn 24 awr o gael eu nodi gan achos positif.