of the 11,889 positive cases that were eligible for follow-up, 10,958 (92.2%) were reached and asked to provide details of their recent contacts
o blith y 11,889 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 10,958 (92.2%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar