Which serologic marker indicates acute Hepatitis B infection?

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Multiple Choice

Which serologic marker indicates acute Hepatitis B infection?

Explanation:
The key you’re looking for is the hepatitis B surface antigen. Its presence in the blood signals active infection with the virus, meaning the virus is currently replicating and the person is contagious. This marker appears early after exposure, often before symptoms, and defines an active infection rather than immunity or past exposure. If this antigen disappears and anti-HBs appears later, immunity has developed or the infection has resolved. In contrast, markers like the surface antibody indicate immunity, while core antibody can reflect a past or recent infection depending on the form (IgM vs IgG). The surface antigen is the best single indicator of acute hepatitis B infection.

The key you’re looking for is the hepatitis B surface antigen. Its presence in the blood signals active infection with the virus, meaning the virus is currently replicating and the person is contagious. This marker appears early after exposure, often before symptoms, and defines an active infection rather than immunity or past exposure. If this antigen disappears and anti-HBs appears later, immunity has developed or the infection has resolved. In contrast, markers like the surface antibody indicate immunity, while core antibody can reflect a past or recent infection depending on the form (IgM vs IgG). The surface antigen is the best single indicator of acute hepatitis B infection.

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