Tan et al. studied the profiles of 28 chronically infected HBeAg+ patients early in their treatment course. Rapid upregulation of the IFN signalling pathway by PEG-IFNα occurred concurrently with increased detection of IL-15, IL-6, CXCL-10 and upregulated frequency of proliferating NK and activated total CD8+ T cells. Inhibiting HBV replication with tenofovir disoproxil fumarate partly compensated for the diminished immune response after the first PEG-IFNα dose.