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Immune dissociation during acute hepatitis E infection.

Jose D Debes1, Zwier M A Groothuismink2, Michail Doukas3

  • 1Department of Medicine, University of Minnesota, Minneapolis, MN, USA; Department of Gastroenterology and Hepatology, Erasmus MC, University Medical Center, Rotterdam, The Netherlands.

International Journal of Infectious Diseases : IJID : Official Publication of the International Society for Infectious Diseases
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Summary

This case study shows distinct immune responses in acute hepatitis E virus (HEV) infection. The immune system initially fought HEV in the blood, then shifted focus to the liver as the virus persisted there.

Keywords:
Cholestatic hepatitisHEVImmune-regulation

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Area of Science:

  • Hepatology
  • Virology
  • Immunology

Background:

  • Hepatitis E virus (HEV) genotype 3 infection can cause acute hepatitis.
  • Understanding the immune response is crucial for managing HEV infection.

Observation:

  • A patient with acute HEV genotype 3 infection presented with typical hepatitis symptoms and detectable HEV RNA in blood.
  • The infection progressed to cholestatic disease despite viral clearance from the blood, with HEV detected in liver tissue.
  • Distinct immune profiles were observed during the extrahepatic and intrahepatic phases of the infection.

Findings:

  • The acute phase showed a surge in T-cell mediators, interferon-alpha, and interferon gamma-induced protein 10 (IP-10).
  • Following viral clearance in blood and cholestasis development, inflammatory markers decreased.
  • An increase in anti-inflammatory factors and monocyte/macrophage markers indicated an intrahepatic immune response.

Implications:

  • This case highlights the dissociation between intrahepatic and extrahepatic immune responses in acute HEV infection.
  • Immune profiling may help differentiate between viral clearance and persistent intrahepatic infection.
  • The findings suggest hepatic resident cells play a key role in the immune response to intrahepatic HEV.