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Virus-Induced Immunosuppression in Chickens.

I M Gimeno1, K A Schat2

  • 1A Department of Population Health and Pathobiology, College of Veterinary Medicine, North Carolina State University, Raleigh, NC 27607.

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Summary
This summary is machine-generated.

Three common viral diseases, Marek's disease virus (MDV), chicken infectious anemia virus (CIAV), and infectious bursal disease virus (IBDV), cause immunosuppression in chickens, impacting poultry production. Understanding their interactions is crucial for effective disease control and maintaining flock health.

Keywords:
Marek's disease viruschicken infectious anemia viruschickensimmunosuppressioninfectious bursal disease virus

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Area of Science:

  • Poultry immunology
  • Veterinary virology
  • Immunosuppression in chickens

Background:

  • A healthy immune system is vital for poultry production; immunosuppression (IS) negatively impacts production and increases costs.
  • Infectious and non-infectious factors can cause IS in chickens, with viral diseases being significant contributors.
  • Marek's disease virus (MDV), chicken infectious anemia virus (CIAV), and infectious bursal disease virus (IBDV) are primary viral inducers of IS in chickens.

Purpose of the Study:

  • To review the three most common viral diseases inducing immunosuppression in chickens: MDV, CIAV, and IBDV.
  • To examine the individual effects of these viruses on the chicken immune system.
  • To highlight the critical, often underestimated, interactions among MDV, CIAV, and IBDV.

Main Methods:

  • Literature review of viral immunosuppressive diseases in chickens.
  • Analysis of the immunological impacts of MDV, CIAV, and IBDV.
  • Examination of viral interactions and their implications for disease control.

Main Results:

  • MDV-induced IS affects both humoral and cellular immunity, is complex, and often underdiagnosed.
  • CIAV causes anemia, hemorrhages, and impairs T helper and cytotoxic T lymphocyte (CTL) functions.
  • IBDV destroys B-cell populations, impacting innate and humoral immune responses.

Conclusions:

  • Effective control of IBDV is necessary for adequate humoral immunity against CIAV.
  • Controlling MDV is challenging in CIAV coinfections due to compromised CTL functions.
  • Understanding and managing the interactions between MDV, CIAV, and IBDV is essential for poultry health and production.