CD4 and infection: The percentages of CD21+ (B cells), WC1+ (γδ-T cells), CD4+ (helper T cells), CD8+ (cytotoxic T cells), CD14+ (monocytes/macrophages) and CD335+ (NK) cells were studied in the population of PBMC from G-NcSpain7, G-NcSpain1H and G-Control by flow cytometry at different times post-infection (Figure 2 and Supplementary S1).