Inclusion Criteria:  Kidney transplant patients with a BK-viraemia ≥ 10,000 IU/ml. Be ≥ 18 years old and ≤ 90 years old Existing hemodialysis access  Exclusion Criteria:  Subject is currently participating in another clinical investigation Pregnant or nursing subjects and those who plan pregnancy during the clinical investigation follow-up period Presence of comorbid conditions, or other medical, social, or psychological conditions that, in the investigator's opinion, could limit the subject's ability to participate in the clinical investigation or to comply with follow-up requirements, or impact the scientific soundness of the clinical investigation results Have Child-Pugh Class C cirrhosis Have platelet count <30.000/uL Contraindications for heparin sodium for injection Subjects demonstrating any contraindication for this treatment as described in the IFU Patients without existing hemodialysis access