The second looks at the difference between the positive case that identified them being referred to the contact tracing system and when the close contact was successfully contacted.
Mae'r ail fesurydd yn edrych ar y gwahaniaeth rhwng pan y cafodd yr achos positif a nododd y cyswllt ei atgyfeirio i'r system olrhain cysylltiadau, a phan y llwyddwyd i gysylltu â’r cyswllt agos.