Infectious bronchitis virus variants in chickens: evolution, surveillance, control and prevention

ABSTRACT: Infectious bronchitis is a disease of the upper respiratory tract of chickens caused by a Gammacoronavirus (infectious bronchitis virus, IBV). Severe economic losses are caused by IBV due to a reduction in egg production and/or egg quality in layers in addition to poor feed conversion and...

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Autor principal:	Gallardo,Rodrigo A.
Lenguaje:	English
Publicado:	Universidad Austral de Chile. Facultad de Ciencias Veterinarias 2021
Materias:	IBV variants variability evolution surveillance
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0719-81322021000100055
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spelling	oai:scielo:S0719-813220210001000552021-02-07Infectious bronchitis virus variants in chickens: evolution, surveillance, control and preventionGallardo,Rodrigo A. IBV variants variability evolution surveillance ABSTRACT: Infectious bronchitis is a disease of the upper respiratory tract of chickens caused by a Gammacoronavirus (infectious bronchitis virus, IBV). Severe economic losses are caused by IBV due to a reduction in egg production and/or egg quality in layers in addition to poor feed conversion and increased condemnations in broiler chickens. The extreme variability of this virus is in part due to its RNA genome, which predisposes it to mutations and generates genetic variation. In addition, recombination events add to the variability of this virus. IBV variability was first described in 1956 by Jungherr. Since then, dozens of serotypes and hundreds of genotypes have been reported. Variant IBV strains are those that, can escape from the immunity generated by conventional strains, despite not being ful ly different from conventional strains affecting a geographic region. At the genomic level, these differences can be equal or greater than 5% of the hypervariable region of the S1 gene. These variant strains are usually restricted to geographic regions and most of the time are transient, reason why diagnostics and epidemiological surveillance are crucial to determine their existence and persistence. The main goal of surveillance is to assist the development of efficient preventative measures in the field. This review aims to critically analyse the literature related to IBV variability and judiciously comment and discuss on howto better prevent this poultry endemic disease.info:eu-repo/semantics/openAccessUniversidad Austral de Chile. Facultad de Ciencias VeterinariasAustral journal of veterinary sciences v.53 n.1 20212021-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0719-81322021000100055en10.4067/S0719-81322021000100055
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	IBV variants variability evolution surveillance
spellingShingle	IBV variants variability evolution surveillance Gallardo,Rodrigo A. Infectious bronchitis virus variants in chickens: evolution, surveillance, control and prevention
description	ABSTRACT: Infectious bronchitis is a disease of the upper respiratory tract of chickens caused by a Gammacoronavirus (infectious bronchitis virus, IBV). Severe economic losses are caused by IBV due to a reduction in egg production and/or egg quality in layers in addition to poor feed conversion and increased condemnations in broiler chickens. The extreme variability of this virus is in part due to its RNA genome, which predisposes it to mutations and generates genetic variation. In addition, recombination events add to the variability of this virus. IBV variability was first described in 1956 by Jungherr. Since then, dozens of serotypes and hundreds of genotypes have been reported. Variant IBV strains are those that, can escape from the immunity generated by conventional strains, despite not being ful ly different from conventional strains affecting a geographic region. At the genomic level, these differences can be equal or greater than 5% of the hypervariable region of the S1 gene. These variant strains are usually restricted to geographic regions and most of the time are transient, reason why diagnostics and epidemiological surveillance are crucial to determine their existence and persistence. The main goal of surveillance is to assist the development of efficient preventative measures in the field. This review aims to critically analyse the literature related to IBV variability and judiciously comment and discuss on howto better prevent this poultry endemic disease.
author	Gallardo,Rodrigo A.
author_facet	Gallardo,Rodrigo A.
author_sort	Gallardo,Rodrigo A.
title	Infectious bronchitis virus variants in chickens: evolution, surveillance, control and prevention
title_short	Infectious bronchitis virus variants in chickens: evolution, surveillance, control and prevention
title_full	Infectious bronchitis virus variants in chickens: evolution, surveillance, control and prevention
title_fullStr	Infectious bronchitis virus variants in chickens: evolution, surveillance, control and prevention
title_full_unstemmed	Infectious bronchitis virus variants in chickens: evolution, surveillance, control and prevention
title_sort	infectious bronchitis virus variants in chickens: evolution, surveillance, control and prevention
publisher	Universidad Austral de Chile. Facultad de Ciencias Veterinarias
publishDate	2021
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0719-81322021000100055
work_keys_str_mv	AT gallardorodrigoa infectiousbronchitisvirusvariantsinchickensevolutionsurveillancecontrolandprevention
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Infectious bronchitis virus variants in chickens: evolution, surveillance, control and prevention

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