Demographic and illness details of groups 1a and 1b (median (range))
| 1a (no biopsy) | 1b (biopsy) | |
| n | 26 | 21 |
| Age | 45 (20–66) | 50 (28–69) |
| Sex (F/M) | 15/11 | 13/8 |
| Duration of fever (days) | 2 (0–14) | 3 (0–8) |
| Duration off normal duties (days) | 7 (0–24) | 4 (0–8) |
| Bowel frequency at 12 weeks | 1 (1–5) | 1 (0.3–3) |
| Urgent bowel movements (days/week) at 12 weeks | 0 (0–7) | 1 (0.3–3) |
| No (%) bowels back to normal at 12 weeks | 15 (58) | 14 (67) |
There were no significant differences between groups.