of the 8,917 positive cases that were eligible for follow-up, 8,362 (94%) were reached and asked to provide details of their recent contacts
o blith y 8,917 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 8,362 (94%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar