The number of activated (CD44+), Myd88-/- vs. Myd88+/+ 1807 cells was not reduced at day 7 post-vaccination (burst of T cell expansion) (Fig 2A), at day 35 (contraction of T cells) (Fig 2B) and at day 4 post-infection (recall to the lung) (Fig 2C). This evidence concerns the gene MYD88 and infection.