In the hepatitis B serology case, which marker indicates a lack of protective immunity against HBV?

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Study for the Success! In Clinical Laboratory Science – Immunology Test. Prepare with flashcards and multiple choice questions, each question offers hints and explanations. Get ready for your exam!

Multiple Choice

In the hepatitis B serology case, which marker indicates a lack of protective immunity against HBV?

Explanation:
The main idea here is that protective immunity to hepatitis B is shown by the presence of antibodies against the surface antigen, Anti-HBs. When Anti-HBs is detectable, you have immunity from vaccination or prior infection. Conversely, a lack of protective immunity would be indicated by the absence of Anti-HBs (no surface antibodies). The other markers reflect infection status or viral activity rather than immunity: HBsAg shows current infection, Anti-HBc shows prior exposure, and HBeAg indicates active viral replication and high infectivity. So, Anti-HBs tells you about immunity when it’s present, and its absence would signal a lack of protective immunity.

The main idea here is that protective immunity to hepatitis B is shown by the presence of antibodies against the surface antigen, Anti-HBs. When Anti-HBs is detectable, you have immunity from vaccination or prior infection. Conversely, a lack of protective immunity would be indicated by the absence of Anti-HBs (no surface antibodies). The other markers reflect infection status or viral activity rather than immunity: HBsAg shows current infection, Anti-HBc shows prior exposure, and HBeAg indicates active viral replication and high infectivity. So, Anti-HBs tells you about immunity when it’s present, and its absence would signal a lack of protective immunity.

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