CD4 and infection: Splenic CD4+ and CD8+ T cells from mice infected via the i.n. route with FT LVS (7 days post-infection) responded to in vitro stimulation with purified DnaK and Tul4 by producing IFN-γ (Figure 1), demonstrating that DnaK and Tul4 are indeed processed and presented to T cells following infection with FT LVS.