of the 6,586 positive cases that were eligible for follow-up, 6,296 (95.6%) were reached and asked to provide details of their recent contacts
o blith y 6,586 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 6,296 (95.6%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar