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Objective The treatment of liver diseases associated with chronic hepatitis B virus (HBV) infection has become a major clinical challenge, partly due to the many drug-resistant HBV mutants induced by wide application of nucleoside/nucleotide analogues.Currently the rate of resistance to adefovir dipivoxil (ADV) is relatively low, but in China is steadily increasing.We investigated the loci of ADV-induced resistance of HBV isolates obtained from patients with chronic HBV infection-related liver diseases.