of the 582 positive cases that were eligible for follow-up, 480 (82%) were reached and asked to provide details of their recent contacts
o blith y 582 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 480 (82%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar