CD4 and infection: Given the significant increase in the percentage of neutrophils in C57BL/6 mice on day 4 post-infection and previous studies suggesting the use of NLR as a predictor of malaria severity [21,29], we investigated the values of the neutrophil–T cell ratio (Figure 3A), neutrophil–CD4 T cell ratio (Figure 3B), and neutrophil–CD8 T cell ratio (Figure 3C) in the spleens of non-infected and infected mice.