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This study aimed at investigating mutations in the hepatitis B surface protein (HBsAg) in occult hepatitis B virus (HBV) infection (OBI) and their influence on viral antigenicity and phenotype.The characteristics of 61 carriers with OBI (OBI group), 153 HBsAg(+) carriers with serum HBsAg ⩽100IU/ml (HBsAg-L group) and 54 carriers with serum HBsAg >100IU/ml (HBsAg-H group) from 38,499 blood donors...
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