The prevalence of BK polyomavirus infection in outpatient kidney transplant recipients followed in a single center

Clin Transplant. 2008 Sep-Oct;22(5):532-41. doi: 10.1111/j.1399-0012.2008.00817.x. Epub 2008 Jul 22.

Abstract

Background: BK polyomavirus (BKV) infection has emerged as an important cause of renal allograft loss. There is no proven therapy, and much basic clinical information is still lacking.

Methods: We serially enrolled 95 outpatient renal transplant recipients (43% of whom were African American) in a single center cross-sectional screening study to determine the prevalence of BKV infection by whole blood polymerase chain reaction, and the prevalence of decoy cells by urinalysis and cytology. We also investigated the demographic and clinical factors associated with BKV infection, and the performance of urinalysis for decoy cells as a screening test for BKV infection.

Results: The point prevalence of active BKV viremia was 7.4%. When subjects without active viremia but with a history of viremia and/or nephropathy were included, the overall prevalence was 15.8%. Urinary decoy cells were common, present in 50% of subjects at study entry. Urinalysis for decoy cells as a screen for BKV viremia had a sensitivity of 86%, specificity of 52%, positive predictive value of 13% and negative predictive value of 98%.

Conclusions: Decoy cells on urinalysis were the only factor independently associated with an increased risk of BKV infection on multivariate analysis. Although associated with BKV infection on univariate analysis, thymoglobulin, mycophenolate mofetil, and tacrolimus use were not independently associated with BKV infection on multivariate analysis, neither were history of acute rejection, gender, race, nor cause of end-stage renal disease.

Publication types

  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Adult
  • Aged
  • BK Virus / immunology*
  • Cohort Studies
  • Cross-Sectional Studies
  • Female
  • Graft Rejection / immunology
  • Graft Rejection / virology*
  • Humans
  • Immunocompromised Host*
  • Kidney Transplantation / immunology*
  • Male
  • Middle Aged
  • Polyomavirus Infections / epidemiology
  • Polyomavirus Infections / immunology*
  • Polyomavirus Infections / urine
  • Predictive Value of Tests
  • Prevalence
  • Tumor Virus Infections / epidemiology
  • Tumor Virus Infections / immunology*
  • Tumor Virus Infections / urine
  • Urinalysis
  • Viremia / epidemiology
  • Virus Shedding