of the 8,938 positive cases that were eligible for follow-up, 8,584 (96%) were reached and asked to provide details of their recent contacts
o blith y 8,938 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 8,584 (96%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar