of the 238,740 positive cases that were eligible for follow-up, 234,897 (98.4%) were reached and asked to provide details of their recent contacts
o blith y 238,740 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 234,897 (98.4%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar