of the 392,356 positive cases that were eligible for follow-up, 370,502 (94.4%) were reached and asked to provide details of their recent contacts
o blith y 392,356 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 370,502 (94.4%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar