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Pubmed ID :11393817
Publication Date : //

Molecular and antigenic characterization of Bangladeshi isolates of infectious bursal disease virus demonstrate their similarities with recent European, Asian and African very virulent strains.


Three isolates of infectious bursal disease virus (IBDV), obtained from chickens in Bangladesh in 1999 and designated as BD 1/99, BD 2/99 and BD 3/99, were characterized. In an antigen capture enzyme-linked immunosorbent assay using a panel of VP2-specific neutralizing monoclonal antibodies (mAb), all three isolates showed a mAb-binding profile similar to that of very virulent IBDV (vvIBDV) strains. In contrast to the classical virulent strains, they did not react with mAb 3 and mAb 4. Molecular characterization was performed by direct sequencing of a 677-base pair cDNA corresponding to the VP2 variable domain of the polyprotein gene, synthesized by a reverse transcription-polymerase chain reaction. In comparison to the classical virulent strains, the Bangladeshi isolates were found to have five amino acid substitutions in this region. Four of these changes, Pro222Ala, Val256Ile, Leu294Ile and Asn299Ser, were also observed in other vvIBDV strains. The fifth substitution, Glu300Ala, was similar to that in some African strains of IBDV. The results support the observation that antigenically and genetically similar vvIBDV strains, first observed in Europe in the late 1980s, have spread to most parts of the world in a short period of time.

Authors : Islam M R , Zierenberg K , Eterradossi N , Toquin D , Rivallan G , Müller H ,

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