Tynnodd y Byrddau Iechyd sylw hefyd at achosion o nifer o ardaloedd yn Ne Cymru a allai fod wedi cael eu heffeithio yr ydym wedi bod yn eu hadolygu gydag Iechyd Cyhoeddus Cymru, gan gysylltu â'r gwaith sy'n cael ei arwain gan UKHSA.
Health Boards also highlighted cases from a number of areas of South Wales that may have been affected that we have been reviewing with Public Health Wales, linking into the work being led by the UKHSA.