Cumulative incidence probability estimates for any and high-level CMV detection stratified by recipient–donor iciHHV-6 status. The cumulative incidence of (A) any or (B) high-level CMV detection (in HCTs with CMV seropositive recipients or donors) by day 100 postallogeneic HCT. High-level CMV reactivation was defined as >1000 CMV DNA copies/mL plasma or >10 pp65 antigen-positive cells per 200 000 peripheral blood leukocytes. Death was treated as a competing risk event.