there were 940,260 positive cases that were eligible for follow-up, of which 869,912 (92.5%) were reached and asked to provide details of their recent contacts
o blith y 940,260 o achosion positif a oedd yn gymwys i gael camau dilynol, cafwyd gafael ar 869,912 (92.5%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar.