The highest frequency of each population was observed at 1 month post-infection, (Median: 0.0093%; 0.012%; and 0.018% for IL2 + / IFNγ-; IFNγ + /IL2-; and IL2 + /IFNγ + CD4 + T cells, respectively) (Fig. 1D). This evidence concerns the gene IL2 and infection.