Current therapeutic options for chronic hepatitis B virus (HBV) are not effective for all patient subsets and, due to their lack of specificity, often provoke toxicity and off-target effects. CD8+ T cells are essential in the fight against viruses but in chronically HBV-infected patients, these cells become unproductive and difficult to detect. At the recent Annual Meeting of the European Association for the Study of the Liver (EASL), Matteo Iannacone, professor of Pathology and Immunology from IRCCS San Raffaele in Milano, presented a novel interleukin 2 (IL-2)-based immunotherapy approach that used a modular cis-targeting platform to tackle HBV infection specifically in patients suffering from chronic viral infection.