Genomic and biological characteristics of Avian Orthoavulavirus-1 strains isolated from multiple wild birds and backyard chickens in Pakistan

Circulation of the dominant sub-genotype VII.2 of Avian Orthoavulavirus-1 (AOAV-1) is affecting multiple poultry and non-poultry avian species and causing significant economic losses to the poultry industry worldwide. In countries where ND is endemic, continuous monitoring and characterization of fi...

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Veröffentlicht in:Tropical animal health and production 2021-12, Vol.53 (1), p.90-90, Article 90
Hauptverfasser: Wajid, Abdul, Mayahi, Vafa, Yin, Renfu, Ain, Quratul, Mohiuddin, Ayesha, Khalid, Farah, Rehim, Asif, Manan, Abdul, Baksh, Muqadas
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container_issue 1
container_start_page 90
container_title Tropical animal health and production
container_volume 53
creator Wajid, Abdul
Mayahi, Vafa
Yin, Renfu
Ain, Quratul
Mohiuddin, Ayesha
Khalid, Farah
Rehim, Asif
Manan, Abdul
Baksh, Muqadas
description Circulation of the dominant sub-genotype VII.2 of Avian Orthoavulavirus-1 (AOAV-1) is affecting multiple poultry and non-poultry avian species and causing significant economic losses to the poultry industry worldwide. In countries where ND is endemic, continuous monitoring and characterization of field strains are necessary. In this study, genetic characteristics of eleven AOAV-1 strains were analyzed isolated from wild birds including parakeets ( n  = 3), lovebird parrot ( n  = 1), pheasant ( n  = 1), peacock ( n  = 1), and backyard chickens ( n  = 5) during 2015–2016. Genetic characterization (genome size [15,192 nucleotides], the presence of typical cleavage site [ 112− RRQKRF −117 ]) and biological assessment (HA log 2 7 to 2 9 and intracerebral pathogenicity index [ICPI] value ranging from 1.50 to 1.86) showed virulent AOAV-1. Phylogenetic analysis showed that the studied isolates belonged to sub-genotype VII.2 and genetically very closely related (> 98.9%) to viruses repeatedly isolated (2011–2018) from commercial poultry. These findings provide evidence for the existence of epidemiological links between poultry and wild bird species in the region where the disease is prevalent. The deduced amino acid analysis revealed several substitutions in critical domains of fusion and hemagglutinin-neuraminidase genes. The pathogenesis and transmission potential of wild bird-origin AOAV-1 strain (AW-Pht/2015) was evaluated in 21-day-old chickens that showed the strain was highly virulent causing clinical signs and killed all chickens. High viral loads were detected in different organs of the infected chickens correlating with the severity of lesions developed. The continuous monitoring of AOAV-1 isolates in different species of birds will improve our knowledge of the evolution of these viruses, thereby preventing possible panzootic.
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subjects Amino Acid Sequence
Amino acids
Animals
Animals, Wild
Avulavirus - genetics
Avulavirus - physiology
Avulavirus Infections - veterinary
Avulavirus Infections - virology
Biomedical and Life Sciences
Bird Diseases - virology
Birds
Chickens
Economic impact
Epidemiology
Exo-a-sialidase
Galliformes
Genome, Viral
Genomes
Genotypes
Hemagglutinins
Life Sciences
Monitoring
Nucleotides
Organs
Pakistan
Parrots
Pathogenesis
Pathogenicity
Pathogens
Phylogeny
Poultry
Poultry Diseases - virology
Regular Articles
Species
Strains (organisms)
Veterinary Medicine/Veterinary Science
Viral Fusion Proteins - analysis
Virulence
Viruses
Zoology
title Genomic and biological characteristics of Avian Orthoavulavirus-1 strains isolated from multiple wild birds and backyard chickens in Pakistan
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