there were 903,934 positive cases that were eligible for follow-up, of which 839,106 (92.8%) were reached and asked to provide details of their recent contacts
o blith y 903,934 o achosion positif a oedd yn gymwys i gael camau dilynol, cafwyd gafael ar 839,106 (92.8%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar.