ANTIGENIC RELATIONSHIP BETWEEN CHIKUNGUNYA VIRUS-STRAINS AND ONYONG NYONG VIRUS USING MONOCLONAL-ANTIBODIES

Chikungunya (CHIK) strains from Africa and Asia were shown to be antig enically closely related using a panel of monoclonal antibodies (mAb) prepared against strains H817 from Africa and PhH15483 from Asia. The one-way antigenic relationship between CHIK and o'nyong nyong (ONN) vi ruses was demonstrated at the epitope level using the immunofluorescen ce and haemagglutination inhibition techniques. Results of tests with mAb against ONN virus suggest that, while ONN virus has retained most of the CHIK antigenic sites, many of the ONN epitopes have undergone s ufficient conformational change such that mAbs prepared against them d o not recognize sites on CHIK virus.