of the 492,839 positive cases that were eligible for follow-up, 465,210 (94.4%) were reached and asked to provide details of their recent contacts
o blith y 492,839 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 465,210 (94.4%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar