Of the 13,300 close contacts that were eligible for follow-up in Wales, 75% were reached within 24 hours of being identified by a positive case.
O'r 13,300 o gysylltiadau agos a oedd yn gymwys ar gyfer camau dilynol yng Nghymru, cyrhaeddwyd 75% ohonynt o fewn 24 awr o gael eu nodi gan achos positif.