of the 148,098 positive cases that were eligible for follow-up, 146,230 (99%) were reached and asked to provide details of their recent contacts
o blith y 148,098 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 146,230 (99%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar