While infection did not dramatically alter the overall proportion or number of total CD4+ and CD8+ T cells in the blood over time with either route of infection (Fig 1B and 1C and Fig 1F and 1G), we observed the induction of a T cell response that peaked at day 7 post-infection (Fig 1D and 1E and Fig 1H and 1I). This evidence concerns the gene CD4 and infection.