of the 736 positive cases that were eligible for follow-up, 632 (86%) were reached and asked to provide details of their recent contacts
o blith y 736 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 632 (86%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar