Table 3.
Immunofluorescence staining intensity for IgG, IgA, and C3 in SAGN and IgAN biopsies.
| Intensity | IgG | IgA | C3 |
|---|---|---|---|
| Intensity in 78 SAGN biopsies, n (%) | |||
| 0 or trace | 46 (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 trace | 77 | 0 | 8 |
| 1+ | 12 | 1 | 28 |
| 2+ | 10 | 67 | 53 |
| 3+ | 1 | 32 | 11 |
| SAGN versus IgAN P value (Chi square, Fisher test if any count <5) | |||
| 0 or trace | 0.01 | <0.001 | 0.19 |
| 1+ | 0.27 | <0.001 | 0.01 |
| 2+ | 0.4 | 0.002 | 0.04 |
| 3+ | 0.02 | 0.001 | <0.001 |
SAGN, Staphylococcus infection–associated GN; IgAN, IgA nephropathy.