Fig. 2.

JC viremia and viruria in 22 RRMS patients with the infusion number equal to 0 (t0), 30 RRMS patients treated with natalizumab for less than 12 months (<12 months), and 27 RRMS patients treated for more than 12 months (>12 months). The values of JC viremia were always significantly lower than those of JC viruria in each group of RRMS patients analyzed. All the information related to JCV load values is reported in Table 5. Statistical analysis was performed using non-parametric tests and the significance fixed for a p value <0.05