Monitoring of BK virus (BKV) replication. Kaplan–Meier estimates of BKV viruria, viremia, and BKVAN in 168 kidney transplant recipients followed-up for 24 months post-transplant. BKVAN was diagnosed on the basis of histologic findings in allograft biopsy specimens. (A) Cumulative incidence values at month 24 are indicated. (B) Virologic characteristics of viruric, viremic, and BKVAN groups are shown. NA, not applicable.