Long-term immunoprophylaxis with anti-HBs immunoglobulins (HBIgH BV reinfection after liver transplantation for HBVrelated cirrhosis is frequent in the absence of immunoprophylaxis and is associated with poor prognosis, resulting from the development of cirrhosis, fibrosing hepatitis, or fulminant hepatitis. 1-2 The introduction of the long-term use of anti-HBs immune globulins (HBIg) has allowed the reduction of graft reinfection to acceptable levels, resulting in survival rates comparable with, or even better than, those of other indications. [3][4][5] This passive immunoprophylaxis strategy is therefore currently considered the standard treatment to prevent HBV reinfection after liver transplantation for HBV-related cirrhosis. 6 Yet, using this approach, posttransplant HBV recurrence still occurs in 10% to 30% of cases, possibly depending on a variety of factors, such as the amount of HBIg infused, the route and frequency of administration, and the minimum trough levels of anti-HBs maintained during various periods after transplant. 6 According to current recommendations, HBIg should be administered indefinitely after transplant. This is associated with a number of problems, including the limited availability of HBIg, the possible emergence of HBV envelope protein mutations, 7,8 and/or other adverse events, 9,10 and, most importantly, the extremely high costs. 6 Whatever is the prophylactic regimen used (which varies remarkably from one Center to another) and the cost differences of HBIg preparations between U.S. and most Western European countries, the expenses of post-transplant HBIg administration range between $25,000 and $120,000 per year, thus exceeding in a few years those of an uncomplicated transplant.New prophylactic strategies to prevent posttransplant HBV recurrence are therefore needed. New approaches under evaluation include the combination of lower doses of HBIg with antivirals, such as lamivudine, 11,12 and HBV vaccination, as proposed in the recent provocative study of Sanchez-Fueyo et al. 13 from Spain.