The frequency and absolute numbers of multiple immune cell types, including B cells, interstitial and alveolar macrophages, neutrophils, CD8 T cells, CD4 T cells, monocytes and eosinophils were analyzed by ow cytometry at baseline (day 0) and days 1, 3, and 5 post-infection (Fig. 2h–p and Supplemental Fig. 4a-h). This evidence concerns the gene CD4 and infection.