Analysis of CD44 and CD127 expression, that distinguish central memory cells (CD44hi CD127hi) from effector memory cells (CD44hi CD127lo), in subpopulations of CD8+TSKB20/Kb+ T cells revealed that the frequency and number of splenic cells with CM phenotype was significantly higher in AhRd than in WT mice during the chronic phase of the infection (Figure 6C and not shown). This evidence concerns the gene CD8A and infection.