title: Human polyomavirus 9 infection in kidney transplant patients.
abstract: Several human polyomaviruses of unknown prevalence and pathogenicity have been identified, including human polyomavirus 9 (HPyV9). To determine rates of HPyV9 infection among immunosuppressed patients, we screened serum samples from 101 kidney transplant patients in the Netherlands for HPyV9 DNA and seroreactivity. A total of 21 patients had positive results for HPyV9 DNA; positivity rates peaked at 3 months after transplantation, but the highest viral loads were measured just after transplantation. During 18 months of follow-up, HPyV9 seroprevalence increased from 33% to 46% among transplant patients; seroprevalence remained stable at ≈30% in a control group of healthy blood donors in whom no HPyV9 DNA was detected. Further analysis revealed an association between detection of HPyV9 and detection of BK polyomavirus but not of cytomegalovirus. Our data indicate that HPyV9 infection is frequent in kidney transplant patients, but the nature of infection-endogenous or donor-derived-and pathogenic potential of this virus remain unknown.
authors.forename: Els
authors.initials: E
authors.lastname: van der Meijden
authors.forename: Herman F
authors.initials: HF
authors.lastname: Wunderink
authors.forename: Caroline S
authors.initials: CS
authors.lastname: van der Blij-de Brouwer
authors.forename: Hans L
authors.initials: HL
authors.lastname: Zaaijer
authors.forename: Joris I
authors.initials: JI
authors.lastname: Rotmans
authors.forename: Jan Nico Bouwes
authors.initials: JN
authors.lastname: Bavinck
authors.forename: Mariet C W
authors.initials: MC
authors.lastname: Feltkamp
mesh_terms: D000328:Adult; D000368:Aged; D004279:DNA, Viral / Q000097:blood / Q000235:genetics*; D005260:Female; D006801:Humans; D016867:Immunocompromised Host; D016030:Kidney Transplantation; D008297:Male; D008875:Middle Aged; D009426:Netherlands; D011120:Polyomavirus / Q000235:genetics* / Q000302:isolation & purification; D027601:Polyomavirus Infections / Q000097:blood / Q000276:immunology* / Q000821:virology*; D011446:Prospective Studies; D051436:Renal Insufficiency, Chronic / Q000276:immunology / Q000503:physiopathology / Q000601:surgery / Q000821:virology*; D016036:Seroepidemiologic Studies; D014019:Tissue Donors; D019562:Viral Load
chemical_list: D004279:DNA, Viral
keywords: BK polyomavirus; BKPyV; HPyV9; immunocompromised host; immunosuppression; kidney transplant; kidney transplantation; kidney-pancreas transplant; polyomavirus; transplant; viruses