C3 and Microscopic hematuria: And no significant differences were observed in age, sex, SBP, DBP, gross/microscopic hematuria, Scr, serum IgA/IgG/IgM, serum C3, 24-h proteinuria, eGFR, CrCl, BUN, treatment regimes, and histological characteristics between patients with type I infection and patients with type II infection (Table 1).