COMPASS-generated PFSs. COMPASS-generated PFSs at approximately day 90 after HCT in letermovir recipients and preemptive therapy recipients. Cytokine responses were generated after stimulation with CMV IE-1, pp65, and SEB (positive control) antigens. Violin plots show frequency distribution of data and width of sections represent the proportion of a specific value (ie, wider sections represent a greater proportion). Dotted lines represent the interquartile range, and solid lines represent the median. Comparisons were made by Wilcoxon rank-sum tests.