of the 193,850 positive cases that were eligible for follow-up, 192,651 (99.4%) were reached and asked to provide details of their recent contacts
o blith y 193,850 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 192,651 (99.4%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar