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In the study of vaccines for dengue viruses,which are multivalent immunization,genetically and antigenically distinct,we should have more sophisticated understanding of viral immune physiology.Because the immune response to dengue and its role in the pathophysiology of dengue fever and dengue hemorrhagic fever are multifaceted,several different efforts have been made to engineer a protective vaccine.Because of space limitations,this review is focused only on vaccines that have emerged from preclinical studies into clinical trial.