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John Cunningham virus
John Cunningham (JC) virus is a ubiquitous double-stranded DNA virus of the polyomaviridae family 1. It is the etiological agent of the progressive multifocal leukoencephalopathy (PML).
It was reported that ~70% of adults have been exposed to this virus; however, no clinical syndrome has been associated with this acquisition 1.
History and etymology
The virus was first described by Åström et al. in 1958 2, and was first isolated in 1971 by Padgett et al. The latter group assigned the name of the patient to the virus 3.