The human polyomavirus BK (BKP yV): virological background and clinical implications

CH Rinaldo, GD Tylden, BN Sharma - Apmis, 2013 - Wiley Online Library
CH Rinaldo, GD Tylden, BN Sharma
Apmis, 2013Wiley Online Library
Polyomavirus BK (BKPyV) infects most people subclinically during childhood and
establishes a lifelong infection in the renourinary tract. In most immunocompetent
individuals, the infection is completely asymptomatic, despite frequent episodes of viral
reactivation with shedding into the urine. In immunocompromised patients, reactivation
followed by high‐level viral replication can lead to severe disease: 1–10% of kidney
transplant patients develop polyomavirus‐associated nephropathy (PyVAN) and 5–15% of …
Polyomavirus BK (BKPyV) infects most people subclinically during childhood and establishes a lifelong infection in the renourinary tract. In most immunocompetent individuals, the infection is completely asymptomatic, despite frequent episodes of viral reactivation with shedding into the urine. In immunocompromised patients, reactivation followed by high‐level viral replication can lead to severe disease: 1–10% of kidney transplant patients develop polyomavirus‐associated nephropathy (PyVAN) and 5–15% of allogenic hematopoietic stem cell transplant patients develop polyomavirus‐associated haemorrhagic cystitis (PyVHC). Other conditions such as ureteric stenosis, encephalitis, meningoencephalitis, pneumonia and vasculopathy have also been associated with BKPyV infection in immunocompromised individuals. Although BKPyV has been associated with cancer development, especially in the bladder, definitive evidence of a role in human malignancy is lacking. Diagnosis of PyVAN and PyVHC is mainly achieved by quantitative PCR of urine and plasma, but also by cytology, immunohistology and electron microscopy. Despite more than 40 years of research on BKPyV, there is still no effective antiviral therapy. The current treatment strategy for PyVAN is to allow reconstitution of immune function by reducing or changing the immunosuppressive medication. For PyVHC, treatment is purely supportive. Here, we present a summary of the accrued knowledge regarding BKPyV.
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