of the 15,813 positive cases that were eligible for follow-up, 14,546 (92.0%) were reached and asked to provide details of their recent contacts
o blith y 15,813 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 14,546 (92.0%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar