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Flow chart of the study. A total of 110 allo-HCT recipients and 86 healthy controls were enrolled. Results are available for 101 patients and 74 healthy controls at T1 (14 to 35 days post-first dose), for 101 patients and 72 controls at T2 (14 to 42 days post-second dose), for 96 patients and 70 controls at T3 (65 to 115 days post-second dose), and for 68 patients and 48 controls at T4 (135 to 225 days post-second dose).
