86.1% of close contacts that were eligible for follow-up were reached within 48 hours of being identified by a positive case; this equates to 97.2% of those reached being reached within 48 hours
cafwyd gafael ar 86.1% o gysylltiadau agos a oedd yn gymwys i gael camau dilynol o fewn 48 awr ar ôl cael eu nodi gan achos positif; mae hyn gyfystyr â chael gafael ar 97.2% o'r rheini o fewn 48 awr