title: Viruses and progressive multifocal leukoencephalopathy.
mesh_terms: D046508:Culture Techniques; D003711:Demyelinating Diseases / Q000382:microbiology*; D006801:Humans; D007968:Leukoencephalopathy, Progressive Multifocal / Q000150:complications / Q000209:etiology / Q000276:immunology / Q000382:microbiology; D027383:Papillomaviridae / Q000302:isolation & purification; D027382:Polyomaviridae; D013539:Simian virus 40 / Q000302:isolation & purification*; D014776:Virus Cultivation; D014777:Virus Diseases / Q000150:complications