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Difficulty: HardGastroenterology and Hepatology

Match the following Hepatitis B serological and biochemical profiles to their most accurate clinical status.

  • HBsAg (+), HBeAg (+), Anti-HBc IgM (+), Anti-HBs (-), ALT 12501250 U/LAcute Hepatitis B infection
  • HBsAg (+), HBeAg (-), Anti-HBc IgG (+), Anti-HBs (-), HBV DNA 1,1001,100 IU/mL, ALT 2828 U/LInactive chronic Hepatitis B phase
  • HBsAg (+), HBeAg (-), Anti-HBc IgG (+), Anti-HBs (-), HBV DNA 85,00085,000 IU/mL, ALT 165165 U/LHBeAg-negative chronic Hepatitis B (precore/basal core promoter mutant)
  • HBsAg (-), HBeAg (-), Anti-HBc IgG (+), Anti-HBs (+), ALT 2222 U/LResolved natural Hepatitis B infection
  • HBsAg (-), HBeAg (-), Anti-HBc (-), Anti-HBs (+), ALT 2020 U/LImmunity due to Hepatitis B vaccination

Answer

The correct matches associate the distinct serological markers and biochemical findings to their corresponding Hepatitis B clinical states, specifically identifying the high-yield HBeAg-negative mutant strain through its high HBV DNA and elevated ALT despite negative HBeAg.
Hepatology serology interpretation relies on a sequential evaluation of surface antigen/antibody (current infection vs. immunity), core antibodies (acute vs. chronic vs. natural immunity), and e-antigen/DNA levels (viral replication activity). Incorporating ALT and HBV DNA is critical to clinically differentiate a benign inactive carrier phase from a highly pathogenic precore mutant strain.

Step-by-Step Solution

1
Analyze the HBsAg status across all profiles.
Profiles 1, 2, and 3 are HBsAg positive, indicating either acute or chronic active/inactive infection. Profiles 4 and 5 are HBsAg negative, indicating either a resolved infection or vaccination immunity.
HBsAg is the primary hallmark of active viral presence in the bloodstream.
2
Differentiate the HBsAg positive profiles using core antibodies and viral replication markers.
Profile 1 has Anti-HBc IgM, marking an acute infection. Profiles 2 and 3 have Anti-HBc IgG, marking chronicity. Profile 3 demonstrates high DNA and ALT despite being HBeAg negative, which defines a precore mutant. Profile 2 demonstrates low DNA and normal ALT, defining an inactive carrier.
Anti-HBc IgM represents an early, acute immune response. HBV DNA and ALT levels must be assessed in chronic stages to distinguish between active viral replication and a dormant state.
3
Differentiate the HBsAg negative, immune profiles.
Profile 4 contains Anti-HBc IgG, meaning the patient was naturally infected and subsequently cleared the virus. Profile 5 only contains Anti-HBs, meaning the patient was vaccinated.
Vaccines only contain recombinant surface antigens, meaning they only elicit an Anti-HBs response. Natural infection exposes the patient to the viral core, eliciting a permanent Anti-HBc IgG response.

Key Concept

Interpretation of Hepatitis B serological markers (HBsAg, Anti-HBs, Anti-HBc, HBeAg) in conjunction with HBV DNA and ALT levels to distinguish among acute, chronic, precore mutant, inactive, and resolved/vaccinated clinical states.
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Topics

Gastroenterology and Hepatology

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