In cases of progressive multifocal leucoencephalopathy (PML) and associated tumors, where the reactivation of polyomavirus is suspected, PCR is used on a biopsy of the tissue or cerebrospinal fluid to amplify the polyomavirus DNA.
PCR is used on a biopsy of the tissue or cerebrospinal fluid. This was to amplify the polyomavirus DNA. This was in cases of progressive multifocal leucoencephalopathy (PML). This was in cases of associated tumors. The reactivation of polyomavirus is suspected.