The impact of HHV6 viremia on CD4⁺and CD8⁺T-cell reconstitution. LOESS curves of CD4⁺ (A) and CD8⁺ (B) T-cell counts in blood over time after HCT are depicted in patients with (n = 64; red lines) and without (n = 138; blue lines) HHV6 viremia. Patients with steroid-treated severe aGVHD were excluded from these graphs. Gray areas depict 95% CIs of LOESS fit.