The aim of antiviral treatment for hepatitis C is to stop infection progression, prevent liver function deterioration and reduce the risk of hepatitis C related liver disease. Hepatitis C is considered cured when the viral load has been reduced to an undetectable level and sustained at that level for 12-24 weeks after treatment. Fortunately, most people (>95%) who take direct-acting antivirals such as Harvoni are cured. Furthermore, only around 1-2% of patients who were cured after taking Harvoni experience recurrence.