there were 13,009 positive cases eligible for follow-up, of which 9,118 (70.1%%) were reached and asked to provide details of their close contacts**
o blith y 13,009 o achosion positif a oedd yn gymwys i gael camau dilynol, cafwyd gafael ar 9,118 (70.1%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar*