Classical serotype 1 infectious bursal disease viruses (IBDV), but not very virulent (vv) isolates, react with neutralizing monoclonal antibody (NMab) 3 in virus neutralization tests or antigen-capture ELISA. Two other NMabs, 6 and 8, bind to both classical and most vv strains, but not to the atypical 94 432 and 91 168 vv strains, respectively. The basis for such reactivities was investigated by sequencing the genome region encoding the VP2 major immunogenic domain. In classical, variant, vaccine or vv IBDV strains, negative reactions with NMab3 were associated with changes in the Proline-Glycine pair at amino-acid (aa) positions 222–223 (hydrophilic peak A), and negative reactions with NMabs 6 and 8 with aa changes from positions 318 to 324 (hydrophilic peak B). The 91 168 and 94 432 viruses are the first vvIBDVs to present aa changes in peak B.
Archives of Virology – Springer Journals
Published: Jul 1, 1998
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