Infectious Bursal Disease Virus Pathogenesis and Immunology
Summary
Infectious bursal disease virus (IBDV) is a non-enveloped, double-stranded RNA virus that targets the bursa of Fabricius, an organ essential for B-lymphocyte maturation in birds. Upon infection, IBDV exhibits rapid replication in immature B cells, inducing profound lymphoid depletion and compromising both humoral and cellular arms of the immune system. Early infection triggers innate immune sensors such as Toll-like receptors and RIG-I-like receptors, leading to a transient interferon response that the virus subsequently subverts through specific viral proteins. VP5 and other non-structural proteins mediate host shutoff by impairing nucleocytoplasmic transport of key transcription factors, while VP3 and VP2 variants interfere with interferon regulatory factor pathways and potentiate inflammatory signalling. The net result is a biphasic disease: an acute destructive phase of immune organs followed by prolonged immunosuppression, predisposing flocks to secondary infections and reducing vaccine efficacy. Genetic diversity and rapid antigenic drift among circulating strains challenge existing vaccines and complicate control measures. Contemporary research aims to elucidate molecular determinants of virulence, refine reverse-genetics platforms for attenuated vaccine design and unravel the balance between innate sensing and immunopathology. A comprehensive understanding of both pathogenesis and host immunology is critical for the development of next-generation vaccines, antiviral interventions and sustainable management strategies in global poultry production.
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Infectious Bursal Disease Virus Pathogenesis and Immunology publication trend
The graph below shows the total number of articles in infectious bursal disease virus pathogenesis and immunology across all publications each year (not limited to Nature Index journals).
Technical terms
Bursa of Fabricius: A primary lymphoid organ in birds where B-lymphocytes mature.
Innate immunity: The first line of defence involving non-specific sensors and effectors such as interferons and macrophages.
Adaptive immunity: The antigen-specific response mediated by B and T lymphocytes, leading to immunological memory.
Host shutoff: Viral strategy to inhibit host gene transcription or translation, impeding immune signalling.
Very virulent IBDV (vvIBDV): Strains associated with high mortality, severe immunosuppression and rapid spread.
Reverse genetics: A method for manipulating viral genomes to study gene function and develop attenuated vaccines.
References
- Advances on adaptive immune responses affected by infectious bursal disease virus in chicken. Frontiers in Immunology (2024).
- Infectious bursal disease virus VP5 triggers host shutoff in a transcription-dependent manner. mBio (2024).
- Genetic Insight into the Interaction of IBDV with Host—A Clue to the Development of Novel IBDV Vaccines. International Journal of Molecular Sciences (2023).
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