of the 310,204 positive cases that were eligible for follow-up, 297,363 (95.9%) were reached and asked to provide details of their recent contacts
o blith y 310,204 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 297,363 (95.9%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar