| None | 36 (78.3%) | 29 (85.3%) |
| Previous treatments | ||
| Antimicrobials | 7 (15.2%) | 0 |
| Immunosuppressants | 5 (10.9%) | 1 (2.9%) |
| Other | 11 (23.9%) | 3 (8.8%) |
| None | 33 (71.7%) | 31 (91.2%) |