of the 836 positive cases that were eligible for follow-up, 734 (88%) were reached and asked to provide details of their recent contacts
o blith y 836 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 734 (88%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar