of the 1,238 positive cases that were eligible for follow-up, 1,168 (94%) were reached and asked to provide details of their recent contacts
o blith y 1,238 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 1,168 (94%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar