CD4+ and CD8+ T-cell epitopes have been identified on multiple proteins of DENV [19–38]. MHC class I and II restricted minimal T-cell epitopes were characterized in a subset of T cells. While T-cell epitopes have been identified on the structural proteins, the vast majority of T-cell epitopes have been found on nonstructural proteins. Our early studies, using samples from donors who received experimental live-attenuated monovalent DENV vaccines and a smaller set of samples from donors with natural infection in Thailand, demonstrated that the NS3 protein is an immunodominant protein with multiple epitopes throughout the protein