Avian coronavirus

Short description: Species of virus

Avian coronavirus

Virus classification
(unranked):  | Virus
Realm:  | Riboviria
Kingdom:  | Orthornavirae
Phylum:  | Pisuviricota
Class:  | Pisoniviricetes
Order:  | Nidovirales
Family:  | Coronaviridae
Genus:  | Gammacoronavirus
Subgenus:  | Igacovirus
Species:  |

Avian coronavirus

Synonyms

* Avian infectious bronchitis virus[1]
* Infectious bronchitis virus[2]
* Turkey coronavirus[2]
* Pheasant coronavirus[2]
* Duck coronavirus[2]
* Goose coronavirus[2]
* Pigeon coronavirus[2]

Avian coronavirus is a species of virus from the genus Gammacoronavirus that infects birds; since 2018, all gammacoronaviruses which infect birds have been classified as this single species.[3] The strain of avian coronavirus previously known as infectious bronchitis virus (IBV) is the only coronavirus that infects chickens.[3] It causes avian infectious bronchitis, a highly infectious disease that affects the respiratory tract, gut, kidney and reproductive system.[4][5] IBV affects the performance of both meat-producing and egg-producing chickens and is responsible for substantial economic loss within the poultry industry.[6] The strain of avian coronavirus previously classified as Turkey coronavirus causes gastrointestinal disease in turkeys.[3]

## Contents

* 1 Classification
* 2 Recombination
* 3 Pathology
* 3.1 Respiratory system
* 3.2 Kidney
* 3.3 Reproductive system
* 4 Vaccines
* 5 See also
* 6 References
* 7 Further reading

## Classification

IBV is in the genus Gammacoronavirus,[7] or group 3,[6] with a non-segmented, positive-sense single-stranded RNA genome.[8]

It was previously the type species of its genus Igacovirus.[9] When there was only one genus of coronaviruses, the genus Coronavirus, it was the type species of the group of all known coronaviruses.[10]

## Recombination

When two strains of coronavirus IBV infect a host they may recombine during genome replication.[11] Recombination appears to contribute to the genetic variation of the IBV genome found in nature.[12][13]

## Pathology

### Respiratory system

When inhaled, virus will attach to glycoprotein receptors containing sialic acid on ciliated epithelial cells of the respiratory epithelium. The respiratory replication will result in loss of ciliary activity,[14] mucus accumulation, necrosis and desquamation, causing respiratory distress, râles and asphyxia. Local virus replication will result in viremia, spreading the infection into other tissues and organs. Other respiratory diseases of chickens (Mycoplasma gallisepticum, avian infectious laryngotracheitis (Gallid alphaherpesvirus 1), Newcastle disease (avian paramyxovirus 1), Avian metapneumovirus infection may be confused clinically to infectious bronchitis.

### Kidney

Through viremia, some nephrotropic strains (most of high virulence) could infect the kidney epithelium in tubules and nephron, causing kidney failure. At gross examination, kidneys may appear swollen and pale in color and with urates in ureters

### Reproductive system

In hens, the viremic IBV will also reach the oviduct, causing lesions in the magnum (the egg-white gland) and in the uterus (the egg-shell gland), leading to a sharp decline of egg production, shell-less, fragile or roughened shells eggs (uterus lesion) with watery whites (magnum lesion). Infection of chickens at puberty, during the oviduct development, will impede oviduct formation and destroy future laying capacity, resulting in "false layers". However, other diseases affecting layer chickens could lead to that condition.[15]

## Vaccines

There are both attenuated vaccines and inactivated vaccines available. Their effectiveness is diminished by poor cross-protection. The nature of the protective immune response to IBV is poorly understood, but the surface spike protein, the amino-terminal S1 half, is sufficient to induce good protective immunity. Experimental vector IB vaccines and genetically manipulated IBVs—with heterologous spike protein genes—have produced promising results, including in the context of in ovo vaccination.[6]

## See also

* Infectious bronchitis virus D-RNA
* Veterinary virology

## References

1. ↑ ICTV 7th Report van Regenmortel, M.H.V., Fauquet, C.M., Bishop, D.H.L., Carstens, E.B., Estes, M.K., Lemon, S.M., Maniloff, J., Mayo, M.A., McGeoch, D.J., Pringle, C.R. and Wickner, R.B. (2000). Virus taxonomy. Seventh report of the International Committee on Taxonomy of Viruses. Academic Press, San Diego.1162 pp. https://talk.ictvonline.org/ictv/proposals/ICTV 7th Report.pdf
2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 de Groot, Raoul J. (2008). "Revision of the family Coronaviridae" (in en). p. 24. https://talk.ictvonline.org/ictv/proposals/2008.085-122V.v4.Coronaviridae.pdf. "Avian coronavirus (new) (comprised of existing species infectious bronchitis virus, turkey coronavirus, pheasant coronavirus, duck coronavirus, goose coronavirus, pigeon coronavirus)"
3. ↑ 3.0 3.1 3.2 de Wit, J.J. Sjaak; Cook, Jane K.A. (August 2020). "Spotlight on avian coronaviruses". Avian Pathology 49 (4): 313–316. doi:10.1080/03079457.2020.1761010. PMID 32374218.
4. ↑ Casais, R.; Thiel, V.; Siddell, S.G.; Cavanagh, D.; Britton, P. (2001). "Reverse genetics system for the avian coronavirus infectious bronchitis virus". Journal of Virology 75 (24): 12359–12369. doi:10.1128/JVI.75.24.12359-12369.2001. PMID 11711626.
5. ↑ Cavanagh, D. (2001). "A nomenclature for avian coronavirus isolates and the question of species status". Avian Pathology 30 (2): 109–115. doi:10.1080/03079450120044506. PMID 19184884.
6. ↑ 6.0 6.1 6.2 Cavanagh, D (2007). "Coronavirus avian infectious bronchitis virus". Veterinary Research 38 (2): 281–97. doi:10.1051/vetres:2006055. PMID 17296157.
7. ↑ Bande, F; Arshad, SS; Omar, AR; Bejo, MH; Abubakar, MS; Abba, Y (2016). "Pathogenesis and diagnostic approaches of Avian Infectious Bronchitis". Advances in Virology 2016: 4621659. doi:10.1155/2016/4621659. PMID 26955391.
8. ↑ de Vries, A.A.F.; Horzinek, M.C.; Rottier, P.J.M.; de Groot., R.J. (1997). "The genome organisation of the Nidovirales: similarities and differences between arteri-, toro-, and coronaviruses.". Seminars in Virology 8 (1): 33–547. doi:10.1006/smvy.1997.0104. PMID 32288441.
9. ↑ "ICTV Taxonomy history: Avian coronavirus". International Committee on Taxonomy of Viruses (ICTV). https://talk.ictvonline.org/taxonomy/p/taxonomy-history?taxnode_id=202001880.
10. ↑ Cann, Alan, ed (2006). "Coronaviruses". Microbiology @ Leicester. University of Leicester, School of Biological Sciences. http://www-micro.msb.le.ac.uk/3035/Coronaviruses.html. Retrieved 2020-06-15. "Family: Coronaviridae; (Subfamily): ; Genus: Coronavirus; Type Species: Infectious bronchits virus".
11. ↑ Kottier, S.A.; Cavanagh, D; Britton, P (10 November 1995). "Experimental evidence of recombination in coronavirus infectious bronchitis virus.". Virology 213 (2): 569–80. doi:10.1006/viro.1995.0029. PMID 7491781.
12. ↑ Wang, L; Junker, D; Collisson, E.W. (February 1993). "Evidence of natural recombination within the S1 gene of infectious bronchitis virus.". Virology 192 (2): 710–6. doi:10.1006/viro.1993.1093. PMID 8380672.
13. ↑ Jia, W; Karaca, K; Parrish, C.R.; Naqi, S.A. (1995). "A novel variant of avian infectious bronchitis virus resulting from recombination among three different strains.". Archives of Virology 140 (2): 259–71. doi:10.1007/BF01309861. PMID 7710354.
14. ↑ "Ciliary activity of chicken tracheal epithelial cells". YouTube. 2010-11-15. https://www.youtube.com/watch?v=40Vxq5I22pM.
15. ↑ "Infectious Bronchitis: Introduction". The Merck Veterinary Manual. 2006. http://www.merckvetmanual.com/mvm/index.jsp?cfile=htm/bc/206500.htm.

## Further reading

* Gomaa, M.H.; Barta, J.R.; Ojkic, D.; Yoo, D. (2008). "Complete genomic sequence of turkey coronavirus". Virus Research 135 (2): 237–246. doi:10.1016/j.virusres.2008.03.020. PMID 18468711.

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