At day 5 post-ETBF infection, while lungs showed significantly higher accumulation of CD4+ T cells, CD4+Foxp3+ T cells, CD8+ T cells, CD11b+ myeloid cells, CD11b+F4/80+ macrophages, and CD11c+ dendritic cells in the ETBF group compared to the sham control group (Figure 2C), the liver showed higher accumulation of CD4+Foxp3+ T regulatory cells in the ETBF-infected group (Figure 2D). This evidence concerns the gene CD4 and infection.