Hepatitis B surface antigen (English: Hepatitis B surface antigen), referred to as hepatitis B surface antigen, HBsAg, also known as Australian antigen (Australia antigen) or Australian antibody, refers to the surface antigen of hepatitis B virus, a positive antigen test indicates that the patient has been infected Hepatitis B virus, hepatitis B can be acute or chronic (including virus carriers, commonly known as "liver carriers"). Hepatitis B virus is an enveloped virus, and the surface protein of its viral envelope can become a surface antigen, which can be recognized by the corresponding antibody protein when it infects the human body.
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