| Age group | No. of patients | Immunization status | ||
| Immunized adequately | Inadequately | Unimmunized | ||
| <5 years | 2 | - | - | 2 |
| 5 - 10 years | 15 | 1 | 1 | 13 |
| 10 - 15 years | 8 | - | 1 | 7 |
| 15 - 20 years | 7 | - | - | 7 |
| >20 years | 1 | - | - | 1 |