Hi,
How are you? Polyomaviruses are small, nonenveloped DNA viruses, which are widespread in nature where illnesses associated with these viruses occur in times of immune compromise. Tests to quantify the polyomavirus DNA may be made with testing the blood, cerebrospinal fluid, and urine. Identification of virus laden "decoy cells" in urine, and histopathologic demonstration of viral inclusions in the brain parenchyma and renal tubules are also applicable diagnostic methods.