 Acute or chronic HCV infection can lead to liver complications, including liver failure, cirrhosis or liver cancer. For patients with hepatitis C infection, the major clinical question remains the terms of treatment initiation. In Europe, new treatments are available since the approval of three direct acting antivirals. However with the high cost of these treatments, they are currently only available for critically ill patients. Other molecules are currently in advanced clinical development phases. The use of clinical predictors remains relevant for the selection of a suitable treatment for each patient, in particular to limit the adverse effects and reduce costs. Currently the quantification of viral load is a measure of response to treatment; with the recommendation to stop treatment in patients who fail to achieve an undetectable level of viral load. Genetic factors have also been identified as predictors of response to treatment, in particular polymorphisms of the IL-28B gene. Genotyping of this gene is currently performed using classical PCR amplification applied to DNA extracted from blood, with a time to result of 2-3 weeks. We propose in this protocol to test a non-invasive method and rapid test for IL-28B genotype which could be used for point of caring testing, and ultimately better patient management. 