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Virus classification e
(unranked): Virus
Realm: Riboviria
Phylum: incertae sedis
Family: Birnaviridae
Genus: Avibirnavirus
Type species
*Infectious bursal disease virus

Avibirnavirus is a genus of viruses in the family Birnaviridae.[2] Young chickens and other fowl serve as natural hosts. There are currently only one species in this genus: the type species Infectious bursal disease virus. Diseases associated with this genus include: IBDV causes severe inflammation of the bursa of fabricius. The disease causes considerable morbidity and mortality in an acute form or as a consequence of severe immunosuppression provoked by the destruction of immature B-lymphocytes within the bursa of fabricius.[3][4]


Viruses in Avibirnavirus are non-enveloped, with icosahedral and Single-shelled geometries, and T=13 symmetry. The diameter is around 70 nm. Genomes are linear and segmented, around 15.2.9-3kb in length. The genome codes for 5 proteins.[3][4]

Genus Structure Symmetry Capsid Genomic arrangement Genomic segmentation
Avibirnavirus Icosahedral T=13 Non-enveloped Linear Segmented

Life cycle[edit]

Viral replication is cytoplasmic. Entry into the host cell is achieved by penetration into the host cell. Replication follows the double-stranded RNA virus replication model. Double-stranded rna virus transcription is the method of transcription. Young chickens and other fowl serve as the natural host. Transmission routes are contamination.[3][4]

Genus Host details Tissue tropism Entry details Release details Replication site Assembly site Transmission
Avibirnavirus Birds None Cell receptor endocytosis Budding Cytoplasm Cytoplasm Contact


  1. ^ "Virus Taxonomy: 2018b Release" (html). International Committee on Taxonomy of Viruses (ICTV). March 2019. Retrieved 8 November 2019.
  2. ^ Delmas, B; Attoui, H; Ghosh, S; Malik, YS; Mundt, E; Vakharia, VN; Ictv Report, Consortium (January 2019). "ICTV virus taxonomy profile: Birnaviridae". The Journal of General Virology. 100 (1): 5–6. doi:10.1099/jgv.0.001185. PMID 30484762.
  3. ^ a b c "ICTV Report Birnaviridae".
  4. ^ a b c "Viral Zone". ExPASy. Retrieved 15 June 2015.

External links[edit]