Figure 4. Flow cytometry analyses for the patterns of IFN-γ and/or IL-2 production profile of total as well as the Tcm and Tem memory subsets of CD4⁺ T cells (A) and CD8⁺ T cells (B) in a representative animal from each of the three groups with different viral loads: Long-term non-progressors (LTNP), chronic viremia (Chronic), and highly viremic (Viremic).