of the 4,764 positive cases that were eligible for follow-up in Wales, 3,713 (78%) were reached and asked to provide details of their recent contacts
o blith y 4,764 o achosion positif a oedd yn gymwys i'w holrhain yng Nghymru, cyrhaeddwyd 3,713 (78%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar