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Antigenic and genetic diversity of early European isolates of Infectious bursal disease virus prior to the emergence of the very virulent viruses: early European epidemiology of Infectious bursal disease virus revisited?



Antigenic and genetic diversity of early European isolates of Infectious bursal disease virus prior to the emergence of the very virulent viruses: early European epidemiology of Infectious bursal disease virus revisited?



Archives of Virology 149(3): 465-480



Eleven Polish and Hungarian isolates of Infectious bursal disease virus (IBDVs) obtained in the 70/80s (early IBDV) and in the 90s (recent IBDV) were characterized in an Antigen-Capture-ELISA with a panel of neutralizing monoclonal antibodies (Mabs), and by nucleotide sequencing of the VP2 variable domain (vVP2). The viruses were compared with reference IBDV strains, among others with Faragher 52/70 (F52/70, classical, isolated 1970), 89163 (typical very virulent-vvIBDV, isolated 1989) and 91168 (antigenically modified vvIBDV, isolated 1991). Only one of the early isolates (Hungarian strain P1) proved antigenically and genetically similar to F52/70. Other early isolates exhibited no reactivity versus Mabs 3, 4, 5 and/or 8 and had a common previously unrecognized combination of amino acid changes in vVP2. The recent isolates all proved antigenically and genetically related to typical vvIBDV strain 89163, except the Polish isolate 93/35 which proved related to the 91168 strain although no epidemiological relationship had been documented between these viruses in the field. Phylogenetic analysis confirmed that the non-P1 early IBDVs represent a previously unrecognized group among serotype 1 IBDVs. It is discussed whether these early isolates are derivatives of the F52/70-like viruses that might still be present in the field, or whether they represent early IBDV strains that might have been present prior to and progressively replaced by the F52/70-like viruses, as the latter have been replaced by vvIBDVs in the late eighties.

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Accession: 011767822

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PMID: 14991437

DOI: 10.1007/s00705-003-0230-6


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