Lymphocyte reconstitution and viral complications by mycophenolate mofetil (MMF) exposure. CD3+ counts are significantly greater at days 28 and 42, but not day 60, post-HCT with reduced MMF exposure (A), and this trend persists if peripheral blood stem cell recipients are excluded (B). NK counts do not vary with MMF exposure (C). Duration of BK-associated symptoms (D) and cumulative incidence (Cul) of BK-associated hemorrhagic cystitis (E) do not vary with MMF exposure. Statistical significance depicted as: ns for p > 0.05, *, p < 0.05, ** for p < 0.01, *** for p < 0.001, and **** for p > 0.0001.