The<unk>  <unk>   is a type of human polyomavirus (formerly known as papovavirus) and is genetically similar to BK virus and SV40.  It was discovered in 1971 and named after the two initials of a patient with progressive multifocal leukoencephalopathy (PML). The virus is widespread, with 86% of the general population presenting antibodies, but it usually remains latent, causing disease only when the immune system has been severely weakened. The virus causes PML and other diseases only in cases of immunodeficiency, as in AIDS, or immunosuppression, as in organ transplant patients.
JC virus
BK virus
West nile virus
Kunjin virus
Bovine coronavirus
Eastern equine encephalitis virus
California encephalitis virus
Human bocavirus