The cause of death was a iral infection of the brain called progressie multifocal leukoencephalopathy (PML) that is caused by reactiated JC irus.

• 患者死亡的原因是由于一种被称为进行性多灶性白质脑病（PML）的脑部病毒感染所致，感染由JC病毒引发。