of the 59,268 positive cases that were eligible for follow-up, 47,917 (80.8%) were reached and asked to provide details of their recent contacts
o blith y 59,268 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 47,917 (80.8%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar