of the 10,485 positive cases that were eligible for follow-up, 9,764 (93.1%) were reached and asked to provide details of their recent contacts
o blith y 10,485 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 9,764 (93.1%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar