of the 329,524 positive cases that were eligible for follow-up, 315,274 (95.7%) were reached and asked to provide details of their recent contacts
o blith y 329,524 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 315,274 (95.7%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar