Despite the modulated nature of proinflammtory CD4+ T cell responses (Figure 2), changes in cytokines noted in BALF or plasma (Figure 5) and histological dissimilarity (Figure 3) over time we noted no significant difference in the percentage of CD4+ regulatory T cells in lung homogenate at 23 weeks post infection between groups (Figure 6D). This evidence concerns the gene CD4 and infection.