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Hepatitis B surface antigen (HBsAg) is the serologic hallmark of acute Hepatitis B virus (HBV) infection. It can be detected in serum using immunoassays a few weeks after HBV infection, and normally disappears after 4-6 months in recovered patients (1). Antibodies against HBsAg (anti-HBs) appears as a response from the host immune system, and these antibodies neutralize HBV infectivity and clear circulating HBsAg (2). Anti-HBs generally persist in life, indicating recovery and immunity from HBV infection. 乙型肝炎表面抗原（HBsAg）是急性乙型肝炎病毒（HBV）感染的血清学标志。乙型肝炎病毒感染后几周，可以使用免疫测定法在血清中检测到它，并且通常在康复患者中 4-6 个月后消失 (1)。HBsAg 抗体（抗 HBs）表现为宿主免疫系统的反应，这些抗体可中和 HBV 感染性并清除循环中的 HBsAg (2)。抗 HBs 通常会在生命中持续存在，表明 HBV 感染已恢复并具有免疫力。 Some of us may simp
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