of the 738 positive cases that were eligible for follow-up, 724 (98.1%) were reached and asked to provide details of their recent contacts
o blith y 738 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 724 (98.1%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar