Moreover, the reconstitution of lymphocyte subsets, especially T cells, contributes to infection vulnerability and side effects in its degree.19 Reconstitution of CD4+ T cells to more than 5 × 107/L within 100 days was associated with survival, GvHD and viral reactivation in allogeneic HSCT, and was achieved with individualised ATG dosing.20 Unfortunately, we were unable to further differentiate the lymphocyte subsets in this study. The gene discussed is CD4; the disease is infection.