of the 8,370 positive cases that were eligible for follow-up, 7,087 (85%) were reached and asked to provide details of their recent contacts
o blith y 8,370 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 7,087 (85%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar