there were 3,348 positive cases eligible for follow-up, of which 2,966 (88.6%) were reached and asked to provide details of their close contacts*
o blith y 3,348 o achosion positif a oedd yn gymwys i gael camau dilynol, cafwyd gafael ar 2,966 (88.6%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar*