of the 1,476 positive cases that were eligible for follow-up, 1,360 (92%) were reached and asked to provide details of their recent contacts
o blith y 1,476 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 1,360 (92%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar