there were 22,852 positive cases eligible for follow-up, of which 19,217 (84.1%) were reached and asked to provide details of their close contacts
o blith y 22,852 o achosion positif a oedd yn gymwys i gael camau dilynol, cafwyd gafael ar 19,217 (84.1%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar