there were 29,012 positive cases eligible for follow-up, of which 22,509 (77.6%) were reached and asked to provide details of their close contacts
o blith y 29,012 o achosion positif a oedd yn gymwys i gael camau dilynol, cafwyd gafael ar 22,509 (77.6%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar