Abnormalities in Laying Chickens Following Exposure to Infectious Bronchitis Virus at One Day Old

Crinion, R. A. P.; Ball, R. A.; Hofstad, M. S.

doi:10.2307/1588386

Cited by 47 publications

(32 citation statements)

References 4 publications

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“…De Wit, personal communication). The false layer syndrome was first described by several workers (Crinion et al, 1971;Jones & Jordan, 1972) who showed that it was due to neonatal infection of female chicks with a virulent IBV to which they had no maternal antibodies. Epithelial cells of the oviduct are especially susceptible to virulent IBV and the damage results in abnormal oviduct development at maturity, so that some hens fail to lay eggs.…”

Section: Resultsmentioning

confidence: 99%

A reverse transcriptase-polymerase chain reaction survey of infectious bronchitis virus genotypes in Western Europe from 2002 to 2006

2008

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A survey of infectious bronchitis virus (IBV) genotypes in poultry flocks in selected countries in Western Europe was carried out between March 2002 and December 2006. Identification of IBV was by reverse transcriptase-polymerase chain reaction of RNA extracted from oropharyngeal swabs taken from poultry flocks exhibiting signs of clinical disease thought to be attributable to IBV. Part of the hypervariable S1 gene of IBV was sequenced to differentiate between the various genotypes. During the survey, 4103 samples were processed, of which 2419 (59%) were positive for IBV. The predominant IBV genotypes detected were 793B and Massachusetts. The third and fourth most common genotypes were two new economically important field types: Italy02, and a virus similar to genotypes originally detected in China called QX. Analysis of the partial S1 sequences of the genotypes detected suggested that approximately 50% of all 793B, Massachusetts types and D274 IBVs were identical to the homologous commercially available live vaccines. Since 2004 the prevalence of Italy02 (present in all countries from which samples were received) has been declining in all countries except Spain, where it appeared to be the predominant genotype. Since 2004 an IBV genotype has been detected in Holland, Germany, Belgium and France similar to QX and the incidence has increased. QX was not detected in the United Kingdom or Spain. When detections thought to be attributable to vaccines were removed, the dominant genotype in France and Europe overall was 793B; in Germany, Holland and Belgium, it was QX-like IBV; and in the United Kingdom and Spain the dominant genotype was Italy02. The present study is the first to identify the prevalence of both Italy02 and QX field-type variants in poultry flocks in Western Europe. Several novel genotypes have also been detected.

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Section: Resultsmentioning

confidence: 99%

A reverse transcriptase-polymerase chain reaction survey of infectious bronchitis virus genotypes in Western Europe from 2002 to 2006

2008

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“…Pathogenicity for the oviduct of young chickens of various ages caused by four serotypes of IBV has been reported (Crinion et al, 1971;Crinion & Hofstad, 1972a, 1972b and abnormalities in laying hens following exposure to IBV were observed. Interestingly, contrary to these findings, we did not observe gross lesions in the oviducts of chickens infected with the three QX-like viruses in the relatively short period of our experiment.…”

Section: Analysis Of Qx-like Ibvs Recently Isolated In China 51mentioning

confidence: 98%

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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“…Weight and internal quality of normally shelled eggs produced by groups of brown hens experimentally infected at different ages with Infectious Bronchitus virus (IBV) (H52) virus) and BC 14 virus by the conjunctival route, in comparison with a noninfected control group.' 2/32 ( 6) 2/29 ( 7) 3/28 (11) 2/31 ( 6) 2/33 ( 6) 1/34 ( 3)…”

Section: 'mentioning

confidence: 99%

“…Effects of BCI4 virus infection on total egg production, egg weight, and internal egg quality have not been described. The effects of both natural and experimental infectious bronchitis virus (IBV) infection on egg production, egg weight, and 12 egg quality have been reported by several workers (6,7,17,19,20). IBV infection at an early age or during the laying period results in reduced egg production and in adverse effects on external and internal egg quality.…”

Section: Introductionmentioning

confidence: 99%

Effects of experimental infection of fowl with EDS'76 virus, infectious bronchitis virus and/or fowl adenovirus on laying performance

Eck

1983

Veterinary Quarterly

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SUMMARY Following BCI4 (EDS'76) virus infection of brown layer hens at 33 weeks of age, production of normally shelled eggs dropped from 87 per cent to 49 per cent within 3 weeks. The production of soft shelled and shell-less eggs attained a maximum of 33 per cent 3 weeks after infection (p.i.). Shell quality recovered completely within 5 weeks p.i. Egg production problems in White Leghorns infected with BCI4 virus were less severe and of shorter duration than in brown layers. Both in brown layers and in White Leghorns total egg production, mean weight of normally shelled eggs, and internal egg quality were not affectedfollowing BCI 4 virus infection at 33 and 28 weeks of age, respectively. Besides shell abnormalities no clinical disease symptoms were observed. Vaccination with a commercial EDS'76 vaccine (Nobivac EDS'760) at 17 weeks of age had no adverse effects on laying performance and provoked adequate immunity against challenge at 33 weeks of age. The same observations were made following BCI4 virus infection at 17 weeks of age. After infectious bronchitis virus (IBV) (H52 virus) infection of laying fowl the percentage of eggs with shell aberrations (rough, misshapen and/ or soft shells) increased to a maximum of 8 per cent, total egg prodtiction was depressed, mean egg weight was reduced I to 2 grams, and up to 10Per cent of normally shelled eggs showed watery, not ropy thin albumen. This abnormally thin albumen was observed in a considerably higher proportion of eggs with shell defects than in normallr shelled eggs. No turbidity of the thick albumen was observed and no symptoms of respiratory disease were noticed. The severity and duration of adverse effects of 1BV infection on laying performance depend very much on the stage of production in which the infection occurs. Following 1BV infection at the onset of production a much severer drop in total production and in production of normally shelled eggs, a greater increase in the number of abnormally shelled eggs, and more lasting adverse effects on egg weight and internal egg quality were observed, in comparison with infection after peak production. Compared with single infections, a combined BC14 virus and 1BV infection of brown layers at 33 weeks of age resulted in greatly potentiated adverse effects on total egg production, number ofeggs with aberrant internal quality, and duration.of production problems.Following a combined BC14 virus and 1BV infection, in a great proportion of eggs with shell defects and watery thin albumen, turbidity of the thick albumen was observed also, probably due to combined effects on the uterus of both 1BV and BC14 virus. BC14 virus infection did not reinforce the adverse influence of 1BV infection on egg weight. The same observations as described for the combined BCI4 virus and IBV infection were made following BCI4 virus infection of fowl previously infected with 1BV.It is concluded that changes of internal egg quality in field cases of EDS'76 are most likely due to subclinical IBV infections. After infection of brown laye...

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Abnormalities in Laying Chickens Following Exposure to Infectious Bronchitis Virus at One Day Old

Cited by 47 publications

References 4 publications

A reverse transcriptase-polymerase chain reaction survey of infectious bronchitis virus genotypes in Western Europe from 2002 to 2006

A reverse transcriptase-polymerase chain reaction survey of infectious bronchitis virus genotypes in Western Europe from 2002 to 2006

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

Effects of experimental infection of fowl with EDS'76 virus, infectious bronchitis virus and/or fowl adenovirus on laying performance

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