Case 5: viral load, clinical symptoms, and other relevant clinical data of a 19-year-old man with ALL undergoing PBSC transplant and BK virus associated hemorrhagic cystitis. ALL, acute lymphocytic leukemia; CBI, continuous bladder irrigation; IV, intravenous; PBSC, peripheral blood stem cell; RBC, red blood cells; Tacro, tacrolimus; UA, urine analysis.