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Journal of Veterinary Medical Research
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Zanaty, A., Hagag, N., Samy, M., abdel-Halim, A., A. Soliman, M., Arafa, A., Nasif, S. (2017). Molecular and pathological studies of duck hepatitis virus in Egypt. Journal of Veterinary Medical Research, 24(2), 194-204. doi: 10.21608/jvmr.2017.43283
Ali Zanaty; Naglaa Hagag; Mohamed Samy; Ahmed abdel-Halim; Mohamed A. Soliman; Abdel-Satar Arafa; Soad Nasif. "Molecular and pathological studies of duck hepatitis virus in Egypt". Journal of Veterinary Medical Research, 24, 2, 2017, 194-204. doi: 10.21608/jvmr.2017.43283
Zanaty, A., Hagag, N., Samy, M., abdel-Halim, A., A. Soliman, M., Arafa, A., Nasif, S. (2017). 'Molecular and pathological studies of duck hepatitis virus in Egypt', Journal of Veterinary Medical Research, 24(2), pp. 194-204. doi: 10.21608/jvmr.2017.43283
Zanaty, A., Hagag, N., Samy, M., abdel-Halim, A., A. Soliman, M., Arafa, A., Nasif, S. Molecular and pathological studies of duck hepatitis virus in Egypt. Journal of Veterinary Medical Research, 2017; 24(2): 194-204. doi: 10.21608/jvmr.2017.43283

Molecular and pathological studies of duck hepatitis virus in Egypt

Article 5, Volume 24, Issue 2, Summer and Autumn 2017, Page 194-204  XML PDF (1.1 MB)
Document Type: Original Article
DOI: 10.21608/jvmr.2017.43283
Authors
Ali Zanaty; Naglaa Hagag; Mohamed Samy; Ahmed abdel-Halim; Mohamed A. Soliman; Abdel-Satar Arafa; Soad Nasif
National Laboratory for Veterinary Quality Control on poultry production NLQP, P.O. Box 264, Dokki, 12618, Giza, Egypt.
Abstract
Duck Hepatitis virus (DHV) causes great economic losses in waterfowl
industry worldwide. 3D gene, lies in the P3 segment of the picornavirus
genome, is highly conserved and is a non-structural polyprotein gene, its
encoding protein contains a conserved domain termed RNA-dependentRNA polymerase which participates in the synthesis of virus RNA
during virus replication. The current work describes the surveillance of
DHV in 20 commercial duck farms in Egypt with a history of high
mortality in 3 to 15 day-old young ducklings from 2014 to 2016. Clinical
samples were examined by Real Time-Polymerase Chain Reaction
assays followed by partial sequence analysis of the 3D gene of the
positive samples. Histopathological examination of the liver from
selected samples was also conducted. The overall positive rate was 50%
(n = 10/20). All duck breeds (Pekin, Muscovy and Mallard) used in the
study were found to be susceptible to the disease. Histopathological
findings of the liver samples showed pronounced lesions including
hepatocyte degeneration and necrosis. Also, apoptosis were observed and
bile duct hyperplasia, together with varying degrees of inflammatory cell
response and haemorrhage. Sequence and phylogenetic analyses
indicated that the Egyptian strains cluster in the DHAV serotype 1 with
Asian viruses and distant from the vaccine strains used in Egypt.
Keywords
Duck Hepatitis virus (DHV); histopathology; 3D gene; Sequencing; Phylogeny
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