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Current Topics in Virology   Volumes    Volume 19 
Molecular characterization of wild infectious bursal disease viruses (IBDV) that are implicated in vaccination failures in North East of Algeria
Amine Boudaoud, Bakir Mamache, Wafa Tombari, Jihene Lachhab, Abdeljelil Ghram, Nadir Alloui
Pages: 1 - 8
Number of pages: 8
Current Topics in Virology
Volume 19 

Copyright © 2022 Research Trends. All rights reserved

The low efficiency of weakly attenuated vaccines in controlling Algerian field infectious bursal disease viruses (IBDV) suggests an increase of virulence in circulating viruses. To confirm the hypervirulent nature of these viruses, five IBDV-positive samples, originating from the Northeast of Algeria, were genetically characterized. Using a pair of primers selected from a well-conserved region in a viral genome encoding the VP2 variable region, one cDNA fragment of 743 bp was reverse-transcribed and amplified in one-step reverse transcription-polymerase chain reaction (RT-PCR). The five fragments were subjected to sequence and phylogenetic analysis including some reference strains available in GenBank. The five studied isolates showed a little antigenic drift as attested by a low nonsynonymous to synonymous ratio of nucleotide substitution when they were compared with classic IBDV (no more than 0.18). All the conserved putative virulence marker amino acids, that is 222A, 256I, 294I, and 299S were present in all the Algerian strains except the 20ALG isolate which conserved the asparagine (N) at position 299. The studied strains also contained the BspMI and SspI restriction sites, reported as indicative of hypervirulent phenotype. The SspI cleavage site was nevertheless displayed at a different position compared to the one observed in the very virulent (vv) IBDVs. The Algerian strains clustered with the vvIBDV in the phylogenetic consensus tree. Inside the vvIBDV clade, the five Algerian strains grouped in a separate branch and showed no more than 0.4% of amino acid divergence between themselves. This poor antigenic diversity was expected given the short period and the circumscribed region of sampling. Further investigations are needed in future to track the evolution of these viruses.
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