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Genetic diversity of Newcastle disease virus in Pakistan: a countrywide perspective.
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- Author(s): Shabbir, Muhammad Zubair; Zohari, Siamak; Yaqub, Tahir; Nazir, Jawad; Bakr Shabbir, Muhammad Abu; Mukhtar, Nadia; Shafee, Muhammad; Sajid, Muhammad; Anees, Muhammad; Abbas, Muhammad; Khan, Muhammad Tanveer; Ali, Asad Amanat; Ghafoor, Aamir; Ahad, Abdul; Channa, Aijaz Ali; Anjum, Aftab Ahmad; Hussain, Nazeer; Ahmad, Arfan; Goraya, Mohsan Ullah; Iqbal, Zahid
- Source:
Virology Journal; 2013, Vol. 10 Issue 1, p1-10, 10p, 3 Diagrams, 1 Chart, 1 Map- Subject Terms:
- Source:
- Additional Information
- Subject Terms:
- Abstract: Background: Newcastle disease (ND) is one of the most deadly diseases of poultry around the globe. The disease is endemic in Pakistan and recurrent outbreaks are being reported regularly in wild captive, rural and commercial poultry flocks. Though, efforts have been made to characterize the causative agent in some of parts of the country, the genetic nature of strains circulating throughout Pakistan is currently lacking. Material and methods: To ascertain the genetics of NDV, 452 blood samples were collected from 113 flocks, originating from all the provinces of Pakistan, showing high mortality (30-80%). The samples represented domesticated poultry (broiler, layer and rural) as well as wild captive birds (pigeons, turkeys, pheasants and peacock). Samples were screened with real-time PCR for both matrix and fusion genes (1792 bp), positive samples were subjected to amplification of full fusion gene and subsequent sequencing and phylogenetic analysis. Results: The deduced amino acid sequence of the fusion protein cleavage site indicated the presence of motif (112RK/RQRR↓F117) typical for velogenic strains of NDV. Phylogenetic analysis of hypervariable region of the fusion gene indicated that all the isolates belong to lineage 5 of NDV except isolates collected from Khyber Pakhtunkhwa (KPK) province. A higher resolution of the phylogenetic analysis of lineage 5 showed the distribution of Pakistani NDV strains to 5b. However, the isolates from KPK belonged to lineage 4c; the first report of such lineage from this province. Conclusions: Taken together, data indicated the prevalence of multiple lineages of NDV in different poultry population including wild captive birds. Such understanding is crucial to underpin the nature of circulating strains of NDV, their potential for interspecies transmission and disease diagnosis and control strategies. [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of Virology Journal is the property of BioMed Central and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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