Objective:To do mapping and modeling of conformational B cell epitope regions of highly conserved and protective regions of three merozoitecandidate vaccine proteins of Plasmodium vivax(P.vivax),ie.merozoite purface protein-1(PvMSP-1),apical membrane antigen-1 domainⅡ(PvAMA1-DⅡ)and regionⅡof the Duffy binding protein(PvDBPⅡ).and to analyze the immunogenie properties of these predicted epitopes.Methods:3-D structures of amino acid haplotypes from Sri Lanka(available in GeneBank)of PvMSP-1_(19)(n=27),PvAMA1-DⅡ(n=21)and PvDBPⅡ(n=33)were modeled.SEPPA,selected as the best online server was used for conformational epitope predictions,while prediction and moodeling of protein structuve and properties related to immunogenicity was carried out with Geno3D server.SCRATCH Protein Server,NetSurfP Server and standaloneroftware,Genious 5.4.4.Results:SEPPA revealed that regions of predicted conformational epitopes formed 4 clusters in PvMSP-I_(19),and 3 clusters each in PvAMA1-DⅡand PvDBPⅡ,all of which displayed a high degree of hydrophilicity,contained solveut exposed residues,displayed high probability of antigenicity and showed positive antigenic propensity values,that indicated high degree of immunogenicity.Conclusions:Findings of this study revealed and confirmed that different parts of the sequences of each of the conserved regions of the three selected potential vaccine candidate antigens of P.vivax are important with regard to conformational epitope prediction that warrants further laboratory experimental invertigations in in vivo animal models. Objective: To do mapping and modeling of conformational B cell epitope regions of highly conserved and protective regions of three merozoite and candidate vaccine proteins of Plasmodium vivax (P. vivax), ie. Merozoite purface protein-1 (PvMSP-1), apical membrane antigen- 1 domain II (PvAMA1-DII) and region II of the Duffy binding protein (PvDBPII). And to analyze the immunogenie properties of these predicted epitopes.Methods: 3-D structures of amino acid haplotypes from Sri Lanka (available in GeneBank) of PvMSP-I_ (N = 27), PvAMA1-DII (n = 21) and PvDBPII (n = 33) were modeled. SEPAPA, selected as the best online server was used for conformational epitope predictions, while prediction and moodeling of protein structuve and properties related to immunogenicity was carried out with Geno3D server. SCRATCH Protein Server, NetSurfP Server and standalone software, Genious 5.4.4. Results: SEPPA revealed that regions of predicted conformational epitopes formed 4 clusters in PvMSP-I_ (19), and 3 clusters each in PvAMA1-DII and Pv DBPII, all of which displayed a high degree of hydrophilicity, contained solveut exposed residues, displayed high probability of antigenicity and showed positive antigenic propensity values, that indicated high degree of immunogenicity. Conclusions: Findings of this study revealed and confirmed that different parts of the sequences of each of the conserved regions of the three selected potential vaccine candidate antigens of P. vivax are important with regard to conformational epitope prediction that warrants further laboratory experimental invertigations in in vivo animal models.