To this aim, IFN-γ production (Figure 4) after 24 hours of single PhAg (3 μM), single IFN-α (100 IU/ml), or combined (PhAg/IFNα) in vitro stimulations was evaluated on PBMC from 24 HCV-infected patients and 35 HD. This evidence concerns the gene IFNA2 and Huntington disease.