there were 24,068 positive cases eligible for follow-up, of which 21,285 (88.4%) were reached and asked to provide details of their close contacts
o blith y 24,068 o achosion positif a oedd yn gymwys i gael camau dilynol, cafwyd gafael ar 21,285 (88.4%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar.