CD8A and Decreased total neutrophil count: Laboratory tests confirmed severe neutropenia (ANC 100 cells/μL), but normal total lymphocyte count (absolute lymphocyte count 1,800 cells/μL, age-matched range 1,700–6,400 cells/μL) and normal CD3+ and CD4+ T cells despite reduction of CD8+ T cells (148 cells/μL, age-matched range 300–1,600 cells/μL) (Figure 2D) and B cells (total B cells 87 cells/μL, age-matched range 200–2,100 cells/μL) (Figure 2E).