Thousands of people became infected as a result of the Infected Blood scandal and it is also associated with poor healthcare practices and unsafe medical injections outside the NHS.
Cafodd miloedd o bobl eu heintio o ganlyniad i'r sgandal Gwaed Heintiedig ac mae hefyd yn gysylltiedig ag arferion gwael ym maes gofal iechyd a phigiadau meddygol anniogel y tu allan i'r GIG.