However, SeV85AB boosting resulted in a response to infection that contained a higher percentage of Ag85AB-specific poly-functional lung T cells, notably CD4+ T cells with the phenotypes IL-2+TNF-α+/IL-2+, and CD8+ T cells of phenotypes IFN-γ+IL-2+TNF-α+/IL-2+ (Figure 7). Here, CD4 is linked to infection.