IFNA1 and hepatitis D virus infection: At the end of antiviral treatment (week four), peg-IFNα induced a median 1.5-log and 1.4-log decrease in HBV and HDV viremia, respectively (Fig. 1A,B), while HBsAg levels were decreased by median 0.9-log compared to median levels obtained from untreated controls at the same time-point (Fig. 1C).