Table 1: The human polyomaviruses, associated disease and immunocompromised risk groups.

Human polyomavirusAdult seroprevalenceClinical diseasePatient’s risk groups

JCV50%–80%Progressive multifocal leukoencephalopathyHIV-infected, immunomodulatory therapies
BKV≥90%BKV nephropathy, haemorrhagic cystitis, ureteral stenosisSolid organ and HSCT transplant recipients
MCPyV60%–80%Merkel cell carcinoma>50 years of age,
immune suppression
WUPyV≥69%No strong associationNot defined
KIPyV≥55%No strong associationNot defined
HPyV6≥83%No strong associationNot defined
HPyV7≥64%No strong associationNot defined
TSV70%–80%Trichodysplasia spinulosaTransplant recipients,
immune suppression
HPyV934%–70%No strong associationNot defined
MWPyVNot definedNo strong associationNot defined