CD4 and infection: We were able to narrow the infection of the CD6+ lymphocytes to CD4−CD8+ and CD4+CD8+ T lymphocytes using triple staining for NiV antigen, CD8 marker, and CD4 marker (Figure 4): T cells gated for CD8+ and NiV antigen staining had high percentage of cells with positive staining for CD8+ and NiV (Figure 4.A).