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What is the hepatitis B virus surface antigen?

Jan 24, 2025 Source: Cainiu Health
Dr. Gao Jun
Introduction
Under normal circumstances, hepatitis B surface antigen (HBsAg), also known as hepatitis B virus surface antigen, is a capsid protein produced during replication of the hepatitis B virus. It is important to maintain personal hygiene, avoid close contact with individuals infected with hepatitis B virus, and refrain from sharing injection needles, razors, or other personal items that may be contaminated with blood, in order to reduce the risk of infection.

　　Under normal circumstances, the hepatitis B virus surface antigen (HBsAg), also known as hepatitis B surface antigen, is a capsid protein produced during replication of the hepatitis B virus. A detailed analysis is as follows:

　　HBsAg is a component of the outer shell of the hepatitis B virus and is a glycoprotein that does not contain nucleic acid or DNA polymerase activity. It mainly exists as an outer viral protein and has antigenicity, meaning it can stimulate an immune response in the body, but it itself is not infectious or transmissible. After a person becomes infected with the hepatitis B virus, HBsAg appears in the blood and can typically be detected in serum 1 to 2 months after infection. Testing for hepatitis B surface antigen is an important method for diagnosing hepatitis B virus infection. If the test result is positive, it may indicate the presence of the hepatitis B virus in the individual, which could signify an acute infection, chronic infection, or carrier state.

　　It is important to maintain personal hygiene in daily life, avoid close contact with individuals infected with hepatitis B virus, and refrain from sharing personal items such as needles, razors, or other objects that may be contaminated with blood, in order to reduce the risk of infection.

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Is it normal for all the results of the hepatitis B surface antigen test (two pairs and a half) to be negative?
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