The impact of HHV6 viremia on CD4⁺T-cell reconstitution in context of antiviral therapy. LOESS curves of CD4⁺ T-cell counts in patients, grouped as having no HHV6 and no antiviral treatment (n = 115; purple line); having no HHV6 with antiviral treatment (n = 23; blue line); having HHV6 viremia and no antiviral treatment (n = 42; red line); or having HHV6 viremia with antiviral treatment (n = 22; green line). Patients with steroid-treated severe aGVHD were excluded from this graph. Gray areas depict 95% CIs of LOESS fit.