New virus infections.
D000328:Adult; D000818:Animals; D000914:Antibodies, Viral; D002648:Child; D006801:Humans; D016030:Kidney Transplantation; D007968:Leukoencephalopathy, Progressive Multifocal / Q000382:microbiology*; D008297:Male; D011120:Polyomavirus / Q000302:isolation & purification* / Q000472:pathogenicity; D013539:Simian virus 40 / Q000302:isolation & purification* / Q000472:pathogenicity; D014181:Transplantation Immunology; D014184:Transplantation, Homologous; D014412:Tumor Virus Infections / Q000276:immunology*
D000914:Antibodies, Viral