Of the 15,515 positive cases that were eligible for follow-up, 51.5% were reached within 24 hours of referral to the contact tracing system.
o'r 15,515 o achosion positif a oedd yn gymwys ar gyfer camau dilynol, cyrhaeddwyd 51.5% ohonynt o fewn 24 awr o gael eu hatgyfeirio i'r system olrhain cysylltiadau.