of the 961 positive cases that were eligible for follow-up, 917 (95%) were reached and asked to provide details of their recent contacts
o blith y 961 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 917 (95%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar