Table 3.

Immunofluorescence staining intensity for IgG, IgA, and C3 in SAGN and IgAN biopsies.

IntensityIgGIgAC3
Intensity in 78 SAGN biopsies, n (%)
 0 or trace46 (60)20 (25)11 (14)
1+14 (18)15 (19)9 (12)
2+11 (14)34 (44)29 (37)
3+7 (9)9 (12)29 (37)
Intensity in 100 consecutive biopsies with primary IgAN, n
 0 or trace7708
1+12128
2+106753
3+13211
SAGN versus IgAN P value (Chi square, Fisher test if any count <5)
 0 or trace0.01<0.0010.19
1+0.27<0.0010.01
2+0.40.0020.04
3+0.020.001<0.001
  • SAGN, Staphylococcus infection–associated GN; IgAN, IgA nephropathy.