Human Polyomavirus Infections with JC Virus and BK Virus in Renal Transplant Patients

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Abstract
Infection with the human polyomaviruses JC virus and BK virus was studied in 61 immunosuppressed renal transplant patients. Urine cytologic studies, indirect immunofluorescence microscopy, electron microscopy, and serologic studies were used to assess viral activity. Patients records were abstracted for events associated with polyomavirus infections. Polyomavirus excretion in urine was detected in 12 of 61 patients (20%). Eleven excreted JC virus and nine, BK virus. Fourfold hemagglutination-inhibition antibody titer rises occurred in 25 of 61 patients (41%). The serologic data suggested that most JC virus infections were primary, whereas most BK virus infections resulted from virus reactivation. During this 2-year study, 32 of 61 patients (52%) had evidence of active viral replication. Urinary tract excretion was associated with drug-requiring diabetes mellitus (P = 0.001), arterial occlusive disease (P = 0.03), and ureteral stricture with loss of renal function (P = 0.02). Antibody increases to BK virus were associated with a rising seurum creatinine (P = 0.02) and need for transplant biopsy (P = 0.02). Polyomavirus replication was therefore associated with an increased frequency of transplant related complications.

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