of the 126,209 positive cases that were eligible for follow-up, 123,447 (98%) were reached and asked to provide details of their recent contacts
o blith y 126,209 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 123,447 (98%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar