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Description of four scenarios for influenza pandemic
| Scenarios | Proportion immune at start of pandemic by age group | |||||
|---|---|---|---|---|---|---|
| 0-4 | 5-12 | 13-19 | 20-39 | 40-64 | ≥65 | |
| Early vaccination*: | ||||||
| No immunity | 0 | 0 | 0 | 0 | 0 | 0 |
| Pre-existing immunity | 0 | 0 | 0 | 0 | 0.3 | 0.5 |
| Late vaccination†: | ||||||
| No immunity | 0 | 0 | 0 | 0 | 0 | 0 |
| Pre-existing immunity | 0 | 0 | 0 | 0 | 0.3 | 0.5 |
*Before peak of pandemic.
†Peak of pandemic.
