PLG and streptococcal infection: The unique glomerular staining patterns of NAPlr and plasmin activity were found not only in patients with PSAGN but also in some patients with other glomerular diseases, such as C3 glomerulopathy [18,19], membranoproliferative glomerulonephritis (MPGN) type I [20,21], antineutrophil cytoplasmic antibody (ANCA)-associated vasculitis (both ANCA positive [22] and negative [23]), and IgA vasculitis [24], in which a preceding streptococcal infection is suggested by serological markers, and these cases are referred to as SIRN [2,25].