Immunocompromised patients are susceptible to multiple severe viral infections. This paper describes a 4-year-old boy with newly diagnosed B-cell precursor acute lymphoblastic leukaemia. The 4-year-old patient developed haemorrhagic cystitis, obstructive nephropathy and renal failure due to human polyomavirus BK and human adenovirus co-infection. Cidofovir should be used only in life-threatening cases.
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