Excluded from this section are close contacts linked to positive cases outside of Wales and those generated through the NHS COVID-10 App (see glossary for more information).
Wedi'u heithrio o'r adran hon y mae cysylltiadau agos sy'n gysylltiedig ag achosion positif y tu allan i Gymru a'r rhai a gynhyrchir drwy Ap COVID-10 y GIG (gweler y geirfa am ragor o wybodaeth).