there were 9,045 positive cases eligible for follow-up, of which 7,900 (87.3%) were reached and asked to provide details of their close contacts*
o blith y 9,045 o achosion positif a oedd yn gymwys i gael camau dilynol, cafwyd gafael ar 7,900 (87.3%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar*