<prompt> Progressive multifocal leukoencephalopathy is due toJC virusPapova virusMeaslesJapanese encephalitis  <response>: A JC virus Progressive multifocal leukoencephlopathy is due to JC virus. JC virus, a polyomavirus, was first isolated from the diseased brain of a patient with Hodgkins lymphoma who was dying of progressive multifocal leukoencephalopathy PML. This demyelinating disease occurs usually in immunosuppressed persons and is the result of oligodendrocyte infection by JC virus. JC virus has also been isolated from the urine of patients suffering from demyelinating disease. Cryotherapy laser treatment are the most popular therapies for warts, although surgery may be indicated in some cases. At the present time, there is no effective antiviral therapy for treatment of infection with polyomavirus or HPV West Nile virus is an arbovirus. It is transmitted by mosquitoes and birds, especially crows; these animals are a reservoir. WNV causes a rather mild encephalitis in humans, the exception being older patients or those who may be immunocompromised. 