CD4 and lymphopenia: Laboratory investigation showed that our patient had WBC of 9500/uL, lymphopenia (ALC: 600 cells/uL) with low T cells (7 cells/uL), very low both CD4 (4 cells/uL) and CD8 (2 cells/uL), absent B cells (0.00 cells/uL), and normal NK cells count (133 cells/uL) in the lymphocyte subpopulation; T cell function test showed no response to mitogens.