83.4% of positive cases that were eligible for follow-up were reached within 48 hours; this equates to 93.7% of those reached being reached within 48 hours
cafwyd gafael ar 83.4% o achosion positif a oedd yn gymwys i gael camau dilynol o fewn 48 awr; mae hyn gyfystyr â chael gafael ar 93.7% o'r rheini o fewn 48 awr