BK Polyomavirus‐Specific Cellular Immune Responses Are Age‐Dependent and Strongly Correlate With Phases of Virus Replication

The authors characterize BK virus–specific cellular and humoral immunity in immunocompetent controls across a wide age range and in renal transplant recipients, and show that the level of immunity reflects phases of active viral replication either after primary infection in childhood or during reactivation after transplantation.