of the 368,864 positive cases that were eligible for follow-up, 350,116 (94.9%) were reached and asked to provide details of their recent contacts
o blith y 368,864 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 350,116 (94.9%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar