of the 503 positive cases that were eligible for follow-up, 498 (99%) were reached and asked to provide details of their recent contacts
o blith y 503 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 498 (99%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar