Patients with C3 deposition (n = 14) as a group, had more often low C3 levels (43 vs. 18%, p = 0.001), a mixed histologic pattern in kidney biopsy (71 vs. 27%, p = 0.033) and a higher rate of serious infections during follow-up (57 vs. 18%, p = 0.047) compared to those without C3 deposition (n = 11) (Table 3). Here, C3 is linked to infection.