Concomitantly to the activation of immune and inflammatory pathways, the microglia specific allograft inflammatory factor 1 (AIF-1) was significantly up-regulated at 1 day after infection with a peak at 3 days after infection This regulation kinetics is in well accordance to the immunohistochemical detection of AIF-1, showing the distribution of microglia in brain tissue at 1 day after infection and 3 days after infection (Figure 8). This evidence concerns the gene AIF1 and infection.