of the 579 positive cases that were eligible for follow-up, 574 (99%) were reached and asked to provide details of their recent contacts
o blith y 579 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 574 (99%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar