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• W2515892211 endingPage "125" @default.
• W2515892211 startingPage "125" @default.
• W2515892211 abstract "To characterize the circulating infectious bronchitis virus (IBV) strains in Egypt depending on the sequence of the spike-1 (S1) gene [hypervariable region-3 (HVR-3)] and to study the pathotypic features of these strains.In this work, twenty flocks were sampled for IBV detection using RRT-PCR and isolation of IBV in specific pathogen free (SPF) chicks during the period from 2010 to 2015. Partial sequencing and phylogenetic analysis of 400 bp representing the HVR-3 of the S1 gene was conducted. Pathotypic characterization of one selected virus from each group (Egy/Var-I, Egy/Var-II and classic) was evaluated in one day old SPF chicks. The chicks were divided into 4 groups 10 birds each including the negative control group. Birds were inoculated at one day by intranasal instillation of 10(5)EID50/100 μL of IBV viruses [IBV-EG/1212B-2012 (Egy/Var-II), IBV/EG/IBV1-2011 (Egy/Var-I) and IBV-EG/11539F-2011 (classic)], while the remaining negative control group was kept uninfected. The birds were observed for clinical signs, gross lesions and virus pathogenicity. The real-time rRT-PCR test was performed for virus detection in the tissues. Histopathological examinations were evaluated in both trachea and kidneys.The results revealed that these viruses were separated into two distinct groups; variant (GI-23) and classic (GI-1), where 16 viruses belonged to a variant group, including 2 subdivisions [Egy/Var-I (6 isolates) and Egy/Var-II (10 isolates)] and 4 viruses clustered to the classic group (Mass-like). IBV isolates in the variant group were grouped with other IBV strains from the Middle East. The variant subgroup (Egy/Var-I) was likely resembling the original Egyptian variant strain (Egypt/Beni-Suif/01) and the Israeli strain (IS/1494/2006). The second subgroup (Egy/Var-II) included the viruses circulating in the Middle East (Ck/EG/BSU-2 and Ck/EG/BSU-3/2011) and the Israeli strain (IS/885/00). The two variant subgroups (Egy/Var-I and Egy/Var-II) found to be highly pathogenic to SPF chicks with mortalities up to 50% than those of the classic group which was of low virulence (10% mortality). Pathogenicity indices were 25 (Egy/Var-II), 24 (Egy/Var-I) and 8 (classic); with clinical scores 3, 2 and 1 respectively.These findings indicated that the recent circulating Egyptian IBVs have multiple heterogeneous origins in marked diversifying nature of their spread, with high pathotype in specific pathogen free chicks." @default.
• W2515892211 created "2016-09-16" @default.
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• W2515892211 date "2016-01-01" @default.
• W2515892211 modified "2023-10-14" @default.
• W2515892211 title "Genotyping and pathotyping of diversified strains of infectious bronchitis viruses circulating in Egypt" @default.
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• W2515892211 doi "https://doi.org/10.5501/wjv.v5.i3.125" @default.
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