of the 865,040 positive cases that were eligible for follow-up, 803,284 (92.9%) were reached and asked to provide details of their recent contacts
o blith y 865,040 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 803,284 (92.9%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar