The investigator's aim in this study is to evaluate the impact of a new standard of care protocol for the treatment of BK viremia and nephropathy (BKVAN), which includes switching from Tacrolimus to equivalent dose of Cyclosporine in patients who have been diagnosed with BK viremia or BKVAN based on their viral load, overall graft function (estimated glomerular filtration rate), acute rejection, and rate of graft loss due to rejection or BKVAN.
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Kidney function to compare effectiveness of a new care protocol for the treatment of BK viremia (BK PCR viral load over 500 copy) and BKVAN (confirmed by kidney biopsy) with a similar cohort treated with traditional methods.
Timeframe: 12 months