BK VirusPolyomavirusPolyomavirus InfectionsTumor Virus InfectionsPolyomaviridaeJC VirusSimian virus 40DNA, ViralVirus ReplicationRNA VirusesGenes, ViralCell Transformation, ViralAntigens, Polyomavirus TransformingVaccinia virusUrineAntigens, ViralAntigens, Viral, TumorVirus CultivationKidney TransplantationCystitisReceptors, VirusCell LineVirus SheddingViral ProteinsVirus DiseasesDefective VirusesVirus AssemblyPlant VirusesPolymerase Chain ReactionDNA Viruses