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Functionality of the immune system in patients with chronic hepatitis C: trial by superinfections and vaccinations

Maria G Isaguliants1

  • 1Swedish Institute for Infectious Disease Control, Department of Virology, Stockholm, SE 17182, Sweden; and, Ivanovsky Institute of Virology, Moscow, 123098, Russia. maria.isaguliants@smi.ki.se

Expert Review of Vaccines
|August 3, 2007
PubMed

Insights

Chronic hepatitis C (CHC) impairs the immune system, increasing risks for new viral infections and reducing vaccine effectiveness. Patients need tailored protection against common diseases due to compromised immunity.

Area of Science:

  • Immunology
  • Hepatology
  • Infectious Diseases

Background:

  • Chronic viral infections significantly alter host immune responses to subsequent infections and vaccinations.
  • The impact of chronic hepatitis C (CHC) on immune status and functionality requires thorough investigation.

Purpose of the Study:

  • To evaluate how chronic hepatitis C infection affects a host's immune system.
  • To determine the implications for immune memory and the development of new immunity in CHC patients.
  • To assess the need for enhanced protective strategies against various infectious agents and vaccines.

Main Methods:

  • Review of existing data on immune status in chronically HCV-infected individuals.
  • Analysis of immune responses to vaccinations in patients with CHC.
  • Evaluation of the literature concerning viral superinfections in the context of CHC.

Main Results:

  • Chronic hepatitis C may compromise the host, increasing the risk and altering the course of viral superinfections.
  • CHC patients retain immunological memory but exhibit impaired de novo immunity, evidenced by poor responses to hepatitis A and B vaccines.
  • Immunity to other diseases like influenza, varicella, tetanus, and diphtheria may also be affected.

Conclusions:

  • CHC patients require additional protection against blood-borne and other infectious diseases due to selective immune impairments.
  • Vaccination strategies must be adapted to the specific immune deficits observed in CHC.
  • Further research is crucial for developing effective immunoprotective approaches for non-responding CHC patients.

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