IDENTIFICATION BY MONOCLONAL-ANTIBODIES OF SEROTYPE-D STRAINS OF PASTEURELLA-MULTOCIDA REPRESENTING VARIOUS GEOGRAPHIC ORIGINS AND HOST SPECIES

Two outer-membrane proteins (OMPs) of Pasteurella multocida serotype D , designated H and W, possess potentially important serotype D-specifi c antigens, Antigenicity as well as toxigenicity of 55 strains of P. m ultocida representing various serotypes, geographic origins and host s pecies were studied by SDS-PAGE, enzyme-linked immunosorbent assay (EL ISA), immunoblot and polymerase chain reaction (PCR) assays, Based on the electrophoretic mobility of protein H, different OMP patterns were observed within different capsular serotypes, Three monoclonal antibo dies (MAbs) designated MT1, MT2 and MT3 were produced against H and W proteins of P. multocida in BALB/c mice, MAbs MT2 and MT3 reacted with two distinct epitopes on W protein of serotype D in competitive ELISA , MAb MT1 reacted with all serotype D-I strains but not with D-II stra ins, whereas MAb MT2 reacted with both serotype D-I and D-II strains i n dot-ELISA and immunoblot assay, MAb MT3 reacted with all P. multocid a strains belonging to different capsular serotypes in dot-ELISA. None of the MAbs reacted with other gram-negative bacteria tested, indicat ing that protein H has a serotype D-I specific epitope and protein W h as both serotype and species-specific epitopes, PCR assay was used to identify toxigenic strains of P. multocida; 92% of P. multocida strain s possess both toxA gene and MAb MT2 reacting epitope, suggesting a st rong association between MAb MT2 reacting epitopes and toxA gene, Rapi d dot-ELISA with MAb was found to be specific, sensitive and easy to p erform and thus suitable for routine serotyping of P. multocida seroty pe D strains which might be potentially pathogenic.