Frequency of individuals positive for anti-mannan Ig
| n | IgA (%) | IgG (%) | Both (%) | Either (%) | |
| Patients with CD | 349 | 44.4 | 41.8 | 34.4 | 51.9 |
| Affected relatives | 87 | 46.0 | 48.3 | 37.9 | 56.3 |
| Unaffected relatives | 333 | 4.5 | 6.6 | 1.8 | 9.3 |
| Unaffected spouses | 58 | 5.2 | 5.2 | 1.7 | 8.6 |
| Patients with UC | 249 | 7.6 | 4.0 | 2.4 | 9.2 |
| Healthy controls | 132 | 1.5 | 2.3 | 0 | 3.8 |
Serum antimannan Ig levels were quantitated, and positive values were tabulated as greater than 40 EU/ml and 20 EU/ml for IgG and IgA respectively.
CD, Crohn's disease; UC, ulcerative colitis.