A survey of the prevalence of infectious bronchitis virus type 4/91 in Iran

Shapouri, Masoud Reza Seyfi Abad; Mayahi, M; Assasi, K.; Charkhkar, S

doi:10.1556/avet.52.2004.2.4

Cited by 31 publications

(24 citation statements)

References 5 publications

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“…The first isolation of IBV in Iranian flocks was reported in 1994. Currently, Ma5, H120, and attenuated 4/91 IBV-based vaccination strategies have been applied for IB control in poultry farms in Iran (Seyfi Abad Shapouri et al, 2004;Hashemzadeh et al, 2013). However, there have been frequent reports of IB-suspected cases from all over the country because of the immune failure.…”

Section: Discussionmentioning

confidence: 99%

Phylogenetic analysis and full-length characterization of S1 gene of IS-1494 (Variant 2) like infectious bronchitis virus isolates, Iran, 2015

et al. 2016

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Infectious bronchitis virus (IBV), a major pathogen of commercial poultry flocks, circulates in the form of different genotypes. Three IB viruses were isolated from broiler chickens showing respiratory and renal lesions. The isolates were characterized by reverse transcriptase polymerase chain reaction and sequence analysis of the Full-length of the S1. Three isolates were belonged to Variant 2 like (IS/1494 like) IBV genotype. Phylogenetic analysis showed that Variant 2 like isolates formed two clusters and the Iranian and Iraqi isolates were included in the cluster II. Cluster I composed of Israeli, Egyptian and Turkish Variant 2 like IBV Isolates. Three hyper variable regions (HVR) of S1 were determined. The Most variation was seen in HVR2. The findings emphasize the importance of continuous monitoring of IBV, in addition to adjust diagnostic methods, molecular epidemiological studies, development and use of vaccines which are adapted to the changing disease scenario.

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Section: Discussionmentioning

confidence: 99%

Phylogenetic analysis and full-length characterization of S1 gene of IS-1494 (Variant 2) like infectious bronchitis virus isolates, Iran, 2015

et al. 2016

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“…It is one of the major poultry pathogens and causes heavy economic losses. Currently, Ma5, H120, and attenuated 4/91 IBV-based vaccination strategies have been applied for IB control in poultry farms in Iran (11,12). In our study, the prevalence rate was 37.5% and Variant-2 like being the dominant genotype in this region.…”

Section: Discussionmentioning

confidence: 99%

Genotyping of Infectious Bronchitis Viruses in the East of Iran, 2015

et al. 2015

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Background and Aims: Infectious bronchitis virus (IBV) is the causative agent of avian infectious bronchitis, which is characterized by respiratory, reproductive, and renal signs. IBV is a highly variable virus with a large number of genotypes. S1 gene sequencing has been used for molecular epidemiological studies and genotypic characterization of IBV. To better understand the molecular epidemiology of IBV in Iran, we sequenced the S1 gene of IBV field isolates, a total of 40 tracheal and kidney tissue specimens from different commercial broiler flocks in the East of Iran were collected from 2015. Materials and Methods: 15 IBV-positive samples were selected from among the total and were further characterized by sequencing the spike glycoprotein gene. The isolates were confirmed by real-time polymerase chain reaction (PCR) and characterized by sequencing the spike glycoprotein gene. Results: Three genotypes were detected. The percentage of Variant 2 (IS/1494 like), 793/B, and QX genotypes was 66.7%, 26.7%, and 6.6% respectively. We reported the QX as the first time and Variant2 was the dominant genotype in this area. Conclusion: It is an updated and comprehensive study of genotyping of IBV and completes IBV puzzle in the East of Iran.

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“…Since it was first identified in France in 1985 and subsequently identified in Great Britain in 1990, this genotype has spread to many countries and become one of the most predominant types in Europe [2,6,7]. This IBV genotype has also been detected in Middle Eastern and Asian countries, such as Iran and Thailand [6,16]. However, this genotype was not found in our previous report using isolates from up to mid-2003 [14], in which we reported that the recent IBV isolates in Japan could be classified into three major genotypes (JP-I, JP-II and JP-III).…”

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Existence of Avian Infectious Bronchitis Virus with a European-Prevalent 4/91 Genotype in Japan

Mase

Inoue

Yamaguchi

et al. 2008

The Journal of Veterinary Medical Science

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ABSTRACT. Eight isolates of infectious bronchitis virus (IBV) were obtained from various prefectures in Japan during [2003][2004][2005][2006][2007] and were genetically analyzed by reverse transcriptase-polymerase chain reaction (RT-PCR) coupled with direct sequencing. These IBV isolates were classified into three genetic groups, including two that have already been reported (JP-I and JP-III). The remaining group is related to the 4/91 (also known as 793/B) type, prevalent mainly in European countries, and has not been identified in Japan until now. KEY WORDS: epidemiology, genotype, infectious bronchitis virus.J. Vet. Med. Sci. 70(12): 1341-1344, 2008 Avian infectious bronchitis virus (IBV), a member of the Coronaviridae family (order Nidovirales, genus Coronavirus), is a highly contagious pathogen of domestic fowls worldwide. It replicates primarily in the respiratory tract but also in the epithelial cells of the gut, kidney and oviduct [4]. Coronaviruses are enveloped and positive-stranded RNA viruses containing an unsegmented genome approximately 27.6 kilobases (kb) in length [1].The major method of protecting poultry from this disease is the application of live or killed vaccines [4]. In the field, however, the protection afforded by vaccination is not complete, since the high mutation frequency of IBV leads to emergence of new viruses capable of causing disease in chickens [19]. IBV has three major virus-encoded structural proteins: the spike (S) glycoprotein, membrane (M) protein and nucleocapsid (N) protein. The IBV spike is formed by post-translational cleavage of two separate polypeptide components, designated S1 and S2 [3]. Of these, the S1 glycoprotein is associated with virus attachment and is a major target of the neutralizing antibodies in chickens [5,8], so serotypic evolution in IBV is associated primarily with the sequences of the S1 glycoprotein [10,18]. Therefore, recent genetic grouping of IBV has been performed mainly on the basis of the nucleotide sequences of the S1 glycoprotein gene [9,11,12,17,18,20].Previously, our phylogenetic analysis of mainly hypervariable (HVR) regions of S1 glycoprotein genes revealed that Japanese IBV strains could be classified into five genetic groups, one of which is indigenous to Japan and can not be placed within the existing groups in other countries [14].In the present report, to define the epidemiology or relationships among recent IBV isolates in Japan during 2003-2007, we used essentially the same procedure in an attempt to characterize eight Japanese IBV isolates from chickens.The IBV isolates were obtained from prefecture-based regional animal hygiene service centers in Japan (Table 1). Most of the IBV specimens were isolated by two or three passages using 10-day-old embryonated chicken eggs. The presence of IBV in the inoculated embryos was initially determined by IBV-specific reverse transcriptase-polymerase chain reaction (RT-PCR) as described previously [14] and by observation of characteristic embryonic changes such as dwarfing, stunting or curl...

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A survey of the prevalence of infectious bronchitis virus type 4/91 in Iran

Cited by 31 publications

References 5 publications

Phylogenetic analysis and full-length characterization of S1 gene of IS-1494 (Variant 2) like infectious bronchitis virus isolates, Iran, 2015

Phylogenetic analysis and full-length characterization of S1 gene of IS-1494 (Variant 2) like infectious bronchitis virus isolates, Iran, 2015

Genotyping of Infectious Bronchitis Viruses in the East of Iran, 2015

Existence of Avian Infectious Bronchitis Virus with a European-Prevalent 4/91 Genotype in Japan

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