Summary of causes in EM and SJS patients
| EM | SJS | Total | |
| Herpes | 8 (+4?) | 0 | 12 |
| M pneumoniae | 0 | 5 (+5?) | 10 |
| Other infection and/or immunisation | 7 | 5 (including 1 MP) | 12 |
| Infection and/or drug | 3 (including 1 herpes) | 3 (including 1 MP) | 6 |
| Drug | 1 | 1 | 2 |
| Total | 22 | 17 |