Mae Iechyd Cyhoeddus Cymru yn cynnal archwiliad fforensig manwl i bob un o’r achosion hyn i ddarganfod pryd a sut y cafodd pob person ei heintio â’r straen o Dde Affrica, a ph’un a oes unrhyw dystiolaeth ei fod wedi lledaenu’r ehangach yn y gymuned.
Public Health Wales is carrying out a detailed and forensic investigation into each of these cases to discover when and how each person became infected with the South African variant strain and whether there is any evidence of wider community spread.