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Background:Hepatitis B virus(HBV) genotypes vary in their geographical distribution and virological features.Previous investigations have shown that HBV genotype B is a predominant HBV genotype in China.Studies on HBV concerning different isolates frequently meet the question about the HBV reference strain and its representativeness.Although HBV consensus sequences can be generated easily by sequence alignment,they may not exist in nature or could not usually be isolated from patient samples.Thus,the construction of a consensus HBV genome has been proposed.