| Cases n (%) | Controls n (%) | OR 95% CI | |
| Blood transfusion | 5 (5.3) | 11 (7.3) | 0.58 (0.19 to 1.80) |
| Infectious diarrhoea | 2 (2.3) | 13 (8.7) | 0.23 (0.05 to 1.06) |
| Conjunctivitis | 10 (11.0) | 8 (5.3) | 2.1 (0.78 to 5.74) |
| Recurrent oral ulceration | 23 (25.3) | 14 (8.9) | 4.20 (1.96 to 9.0) |
| Immunisation | |||
| Any | 35 (36.1) | 46 (28.75) | 1.41 (0.51 to 2.45) |
| Rubella | 4 (4.6) | 1 (0.7) | 12.4 (1.20 to 122.14) |
| Tetanus | 25 (28.7) | 25 (18.5) | 1.91 (1.0 to 3.7) |
| Typhoid | 7 (8.1) | 3 (2.1) | 3.7 (0.9 to 15.0) |
| Poliomyelitis | 10 (11.4) | 10 (6.7) | 2.0 (0.75 to 5.3) |
| Influenza | 5 (6.0) | 18 (12.2) | 0.40 (0.14 to 1.14) |