title: Modified activity of a VP2-located neutralizing epitope on various vaccine, pathogenic and hypervirulent strains of infectious bursal disease virus.
abstract: Nine monoclonal antibodies (Mabs) to a vaccine strain of infectious bursal disease virus (IBDV) of intermediate virulence were characterized in Western-blot, radioimmunoprecipitation, ELISA additivity, and neutralization assays. At least two distinct serotype 1-specific conformation-dependent overlapping neutralizing antigenic domains were shown to be present on IBDV-VP2, and were respectively probed by Mabs 3 and 4, and by Mabs 6 and 7. Ten serotype 1 vaccine or pathogenic IBDV strains were tested for neutralization. Most mild or intermediate vaccine strains were efficiently neutralized by all Mabs, whereas US variant A, European pathogenic strain Faragher 52/70 and French hypervirulent isolate 89163 were not neutralized by Mabs 3 and 4. In addition, these two Mabs were shown to bind to the Faragher 52/70 strain, but not to the 89163 isolate, in an antigen-capture ELISA. These results suggest that a neutralizing epitope is possibly modified in European pathogenic IBDV strains, and that Mabs 3 and 4 may prove useful for antigenic differentiation between European classical and hypervirulent isolates.
authors.affiliation: Centre National d'Etudes Vétérinaires et Alimentaires (CNEVA), Laboratoire Central de Recherches Avicole et Porcine (LCRAP), Ploufragan, France.
authors.forename: N
authors.initials: N
authors.lastname: Eterradossi
authors.forename: D
authors.initials: D
authors.lastname: Toquin
authors.forename: G
authors.initials: G
authors.lastname: Rivallan
authors.forename: M
authors.initials: M
authors.lastname: Guittet
mesh_terms: D000911:Antibodies, Monoclonal / Q000276:immunology*; D000914:Antibodies, Viral / Q000276:immunology*; D004797:Enzyme-Linked Immunosorbent Assay; D018604:Epitope Mapping; D016056:Immunodominant Epitopes; D007243:Infectious bursal disease virus / Q000276:immunology*; D015678:Viral Structural Proteins / Q000276:immunology*; D014765:Viral Vaccines / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000914:Antibodies, Viral; D016056:Immunodominant Epitopes; C082513:VP2 protein, infectious bursal disease virus; D015678:Viral Structural Proteins; D014765:Viral Vaccines