CD4 and infection: By analyzing the fluorescence of each population of phagocytic (CD11b+, Ly6C+, Ly6G+ and F4/80+) and lymphoid (CD3+, CD4+, CD8+, CD19+ and NK1.1+) cells (Figure 3, representatives on day 10 post-infection), it was found that both CD11b+ and Ly6C+ cells were the predominant fluorescent populations in the spleen, BM and PBMC.