The failure of immune surveillance may be associated with polyomavirus BK reactivation, potentially leading to the development of nephropathy in kidney transplantation. BK-specific cellular immune response may be used to modulate immunosuppressive therapy, but few studies have investigated the topic. Herein, we serially evaluated BK-specific response in 149 kidney transplant recipients and found that only 14/149 (9.4%) were responders. Episodes of viral reactivation (viremia and/or viruria) occurred only in non-responder patients. The frequency of BK-specific immune response appears to be lower than that for other persistently infecting viruses such as cytomegalovirus.
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