of the 253 positive cases that were eligible for follow-up, 206 (81%) were reached and asked to provide details of their recent contacts
o blith y 253 o achosion positif a oedd yn gymwys i'w holrhain, cyrhaeddwyd 206 (81%) a gofyn iddynt ddarparu manylion y bobl y maent wedi dod i gysylltiad â nhw yn ddiweddar