there were 14,821 positive cases eligible for follow-up, of which 13,681 (92.3%) were reached and asked to provide details of their close contacts
o blith y 14,821 o achosion positif a oedd yn gymwys i gael camau dilynol, cafwyd gafael ar 13,681 (92.3%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar