Figure 2: BK virus infection versus clinical HC: (left) Detection of the BK virus by PCR. Urine samples were collected and tested for BKV DNA by quantitative real time polymerase chain reaction analysis. Samples were test by Hightrust Diagnostic, Kindstar Global Co. BKV-DNA test kit was purchased from Beijing SinoMDgene Technology Co.,Ltd (YZB/6671-2012.3400075). BKV copies were shown. (right) Vertical axis (I to III): The clinical HC (the system score is indicated in ref.5, an article by Brugieres et al.). Blue arrows represent cidofovir (5 mg/kg) was given.