More than a decade after the approval of a curative therapy for hepatitis C, hepatitis B has proven more challenging to tackle. Vir Biotechnology, in collaboration with Alnylam Pharmaceuticals, is developing a promising combination approach that marries Vir’s monoclonal antibody tobivibart with Alnylam’s siRNA elebsiran. We spoke to Mark Eisner, chief medical officer of Vir, about hepatitis B, the company’s combination therapy in development with Alnylam, and its platform technologies for developing treatments for infectious disease and oncology.