of the 427,796 positive cases that were eligible for follow-up, 404,176 (94.5%) were reached and asked to provide details of their recent contacts
o blith y 427,796 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 404,176 (94.5%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar