Avian infectious bronchitis virus: isolation of an apparently new variant in Italy

Zanella, A.; Coaro, R.; Fabris, G.; Marchi, Richard D. Di; Llombart‐Bosch, Antonio

doi:10.1136/vr.146.7.191

Cited by 12 publications

(11 citation statements)

References 12 publications

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“…Although these viruses caused respiratory disease and aberrant drop in egg production in layer flocks, they were not associated with poor egg quality (Cook, 1984;Cook and Huggins, 1986). Thereafter, many IBV variants were isolated from the UK (Gough et al, 1996) and in other European countries including France (Picault et al, 1986) Belgium (Meulemans et al, 1987), Italy (Capua et al, 1994;Zanella et al, 2000;, Poland (Minta et al, 1998) and Spain (Dolz et al, 2006;. Among these, of major importance internationally was the variant called 793B that emerged in the1990s and quickly spread to many parts of the world (Gough et al, 1992;Parsons et al, 1992).…”

Section: Incidence and Geographical Distributionmentioning

confidence: 98%

An overview of infectious bronchitis virus in chickens

Awad

Chhabra

Baylis

et al. 2014

World's Poultry Science Journal

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Infectious bronchitis virus (IBV) is one of the foremost causes of economic loss within the poultry industry. IBV is a commonly occurring, economically significant pathogen of commercial chicken. Economic consequences to the poultry industry comprise mortality, growth retardation and high condemnation rates in meat-type birds. In addition, decreased egg production, reduced internal and external egg quality, and reduced hatchability have been documented in layers and breeders affecting the performance of both meat-type and egg-laying birds. Apart from this some nephro-pathogenic strains cause kidney damage. Secondary pathogens can complicate the disease resulting in increased morbidity and mortality. Being a single stranded RNA virus, IBV has an enormous capacity to change both by spontaneous mutation and by genetic recombination resulting into the emergence of new variants. Since the first isolation of virus in 1937, it has been found almost all over the world. In addition, most countries are now known to have their own indigenous IBV variants. Despite the use of currently available live and inactivated vaccines, one of the most important difficulties to control IB is related to emergence of variant strains. The following paper reviews the current status of research into IBV.

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Section: Incidence and Geographical Distributionmentioning

confidence: 98%

An overview of infectious bronchitis virus in chickens

Awad

Chhabra

Baylis

et al. 2014

World's Poultry Science Journal

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“…Subsequently, we found that this type of IBV was the predominant genotype circulating in chicken flocks in China from 1995 to 2007 (Liu et al, 2006(Liu et al, , 2008(Liu et al, , 2009). More recently, the prevalence of this type of IBV, designated QX-like IBV, has been reported in Poland (Domanska-Blicharz et al, 2006), the UK (Gough et al, 2008), Hungary (Benyeda et al, 2008(Benyeda et al, , 2009), Slovakia and Greece (Benyeda et al, 2009), Russia (Bochkov et al, 2006), The Netherlands (Landman et al, 2005), Italy (Beato et al, 2005;Zanella et al, 2006), France, Germany and Belgium , and South Korea (Lee et al, 2008). These findings suggest that this novel type of IBV attained a high prevalence within a few years after it reached European countries .…”

Section: Introductionmentioning

confidence: 99%

Phylogenetic analysis of infectious bronchitis coronaviruses newly isolated in China, and pathogenicity and evaluation of protection induced by Massachusetts serotype H120 vaccine against QX-like strains

Sun

Han

et al. 2011

Avian Pathology

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Seventy-eight isolates of avian infectious bronchitis virus (IBV) were obtained from different field outbreaks in China in 2009 and genotyped with 34 reference strains. Four genotypes of IBV and three new isolates were identified by phylogenetic analysis and BLAST searches of the entire S1 gene. The results showed that most IBV strains that have circulated in China in recent years belong to the genotype of QX-like strains, and that they could be grouped further into two clusters, regardless of the level of genetic variation displayed. A study of pathogenicity that used three QX-like strains*ck/CH/LSD/091003, ck/CH/LDL/091022 and ck/CH/LJL/ 090330*showed that the isolates caused the most severe lesions in the kidneys and were therefore nephropathogenic strains with various levels of virulence in specific pathogen free chickens. A vaccinationÁ challenge test that was performed using the three QX-like strains showed that the commercially available H120 vaccine did not provide sufficient protection against challenge with the QX-like isolates, as demonstrated by comparison of the clinical signs, pathological lesions and virus recovery from the trachea and kidney of unvaccinatedÁchallenged and vaccinatedÁchallenged birds.

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“…The QX serotype was first isolated in China in 1996 from birds with proventriculitis (YuDong et al, 1998), but spread rapidly so that within a few years genetically related strains were isolated from outbreaks with various clinical manifestations from several provinces in China (Yu et al, 2001;Liu and Kong, 2004;Liu et al, 2006) and from the far eastern and European region of Russia (Bochkov et al, 2006). In 2005 the QX serotype was reported from the European continent (Beato et al, 2005;Landman et al, 2005;Zanella et al, 2006) and rapidly spread to become the most widespread serotype of non-vaccine origin (Worthington et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Comparative Histopathology and Immunohistochemistry of QX-like, Massachusetts and 793/B Serotypes of Infectious Bronchitis Virus Infection in Chickens

Benyeda

Szeredi

Mató³

et al. 2010

Journal of Comparative Pathology

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The aim of this study was to compare experimentally the pathogenicity and tissue distribution of the recently emerged QX-like strain of infectious bronchitis virus (IBV) with the widespread M41 and 793/B serotypes of the virus. Histopathological and immunohistochemical methods were employed to define the main sites of virus replication. One-day-old specific pathogen free chickens were inoculated with five different QX-like strains, or with the M41 and 793/B IBV strains and monitored for 42 days post-infection. Tracheal lesions developed in all infected birds, confirming the ability of all of the tested strains to induce respiratory disease. Replication of the isolates in the alimentary tract was detected, but the infection did not cause significant gut lesions. Four of the five QX-like IBV strains induced severe kidney lesions. Dilation of the oviduct with accumulation of serum-like fluid in the lumen of this structure, reported previously from field cases of QX-like IBV infection, was observed following experimental infection with all of the five QX-like strains. Microscopical and immunohistochemical examination of the affected oviducts did not help to elucidate the pathogenesis of this lesion.

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Avian infectious bronchitis virus: isolation of an apparently new variant in Italy

Cited by 12 publications

References 12 publications

An overview of infectious bronchitis virus in chickens

An overview of infectious bronchitis virus in chickens

Phylogenetic analysis of infectious bronchitis coronaviruses newly isolated in China, and pathogenicity and evaluation of protection induced by Massachusetts serotype H120 vaccine against QX-like strains

Comparative Histopathology and Immunohistochemistry of QX-like, Massachusetts and 793/B Serotypes of Infectious Bronchitis Virus Infection in Chickens

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