Infection by polyomavirus BK (BKV) is an emerging problem in the clinical management of renal transplant patients because it is responsible for nephropathy and consequently can cause loss of the transplanted organ (BKV associated nephropathy, BKVAN). Aim of this study was to evaluate the use of blood viral load measurement as a screening tool for diagnosis of BKV infection and to identify a threshold value for the management of patients. A total of 75 kidney transplant patients, corresponding to 338 consecutive plasma samples, were analyzed by an automatic system for nucleic acid extraction and quantitative real-time polymerase chain reaction (PCR) for detection of BKV. BKV was detected in 170 samples (26 patients) with a median viral load of 4.1 log10 copies/mL; among these 26 patients, seven (34.7%) were found to have BKVAN on allograft biopsy together with a median viral load of 5 log10 copies/mL. The ROC curve analysis identified a viral load equal to 4.1 log10 copies/mL as the best discriminant cut-off value to predict the disease and to identify patients at risk of developing BKVAN.
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