of the 444,350 positive cases that were eligible for follow-up, 419,460 (94.4%) were reached and asked to provide details of their recent contacts
o blith y 444,350 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 419,460 (94.4%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar