Patient 2 is a 10-year-old developmentally normal Haitian/African American child who presented at age 16 months with microcytic anemia (HGB 7.0 g/dL, MCV 50.2 fL) and oral candidiasis, mild B cell and CD8+ T cell lymphopenia without hypogammaglobulinemia (Figure 6B). This evidence concerns the gene CD8A and lymphopenia.