of the 154,411 positive cases that were eligible for follow-up, 152,732 (99%) were reached and asked to provide details of their recent contacts
o blith y 154,411 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 152,732 (99%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar