After adoptive transfer of OTII cells, host mice were infected with actA-deficient Listeria monocytogenes (ΔActA-Lm) expressing OVA (Ertelt et al., 2009), and the analysis day 4 post infection revealed that virtually all the Foxo1KO OTII cells were CXCR5+ (Figure 1E). This evidence concerns the gene CXCR5 and infection.