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Dengue virus is the causative agent of dengue fever and the more-severe dengue hemorrhagic fever (DHF). Human studies suggest that the increased risk of DHF during secondary infection is due to immunopathology partially mediated by cross-reactive memory T cells from the primary infection. To model T cell responses to sequential infections, we immunized mice with different sequences of dengue virus serotypes and measured the frequency of peptide-specific T cells after infection. The acute response after heterologous secondary infections was enhanced compared with the acute or memory response after primary infection. Also, the hierarchy of epitope-specific responses was influenced by the specific sequence of infection. Adoptive-transfer experiments showed that memory T cells responded preferentially to the secondary infection. These findings demonstrate that cross-reactive T cells from a primary infection alter the immune response during a heterologous secondary infection.

the journal of infectious diseases (online. university of chicago press)/the journal of infectious diseases

Cross‐Reactive Memory CD8<sup>+</sup>T Cells Alter the Immune Response to Heterologous Secondary Dengue Virus Infections in Mice in a Sequence‐Specific Manner

Cross‐Reactive Memory CD8+T Cells Alter the Immune Response to Heterologous Secondary Dengue Virus Infections in Mice in a Sequence‐Specific Manner

Cross‐Reactive Memory CD8⁺T Cells Alter the Immune Response to Heterologous Secondary Dengue Virus Infections in Mice in a Sequence‐Specific Manner