of the 32,139 positive cases that were eligible for follow-up, 30,343 (94%) were reached and asked to provide details of their recent contacts
o blith y 32,139 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 30,343 (94%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar