of the 460,884 positive cases that were eligible for follow-up, 435,174 (94.4%) were reached and asked to provide details of their recent contacts
o blith y 460,884 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 435,174 (94.4%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar