KATERYNA KON / SCIENCE PHOTO LIBRARY KATERYNA KON / SCIENCE PHOTO LIBRARY
Computer illustration of the capsid of a polyoma BK virus. This polyomavirus is common in the urinary tract of adults, where it lives without harming its host. BK virus has been found to cause the growth of tumours in newborn rodents but there is no evidence that it causes cancer in humans. In monkeys with suppressed immune systems, the virus causes kidney disease and can damage the myelin sheaths surrounding nerve fibres.
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