of the 38,392 positive cases that were eligible for follow-up, 37,195 (97%) were reached and asked to provide details of their recent contacts
o blith y 38,392 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 37,195 (97%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar