there were 36,337 positive cases eligible for follow-up, of which 29,786 (82.0%) were reached and asked to provide details of their close contacts
o blith y 36,337 o achosion positif a oedd yn gymwys i gael camau dilynol, cafwyd gafael ar 29,786 (82.0%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar.