| Clinical symptoms | N | (%) |
| Vomiting | 55 | 17.2 |
| Bloody stool (Red currant stool) | 50 | 15.6 |
| Fever | 50 | 15.6 |
| Abdominal pain | 34 | 10.6 |
| Passage of blood per rectum | 32 | 10.0 |
| Diarrhoea | 30 | 9.4 |
| Abdominal distension | 28 | 8.8 |
| Constipation | 11 | 3.4 |
| Screaming attacks | 11 | 3.4 |
| Total | 320 | 100.0 |