there were 6,323 positive cases eligible for follow-up, of which 5,523 (87.3%) were reached and asked to provide details of their close contacts*
o blith y 6,323 o achosion positif a oedd yn gymwys i gael camau dilynol, cafwyd gafael ar 5,523 (87.3%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar*