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Hepatitis B surface antigen (HBsAg) is a glycoprotein on the surface of hepatitis B virus. �After hepatitis B infection, HBsAg appears as the first viral marker. �HBsAg can be detected in blood, saliva, breast milk, sweat, tears, nasopharyngeal secretions, semen and vaginal secretions of patients 2 to 6 months after infection with HBV. �HBsAg antibodies are mainly used for the diagnosis of hepatitis B virus.
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