Table 2.
Age-group-specific H1N1 influenza illness attack rates in Ontario, Canada, 2009, and calibrated attack rates
| Simulated Ontario Illness Attack Rates by the Percentage of Adults 53+ Years Old with Pre-existing Immunity1 | Calibrated Attack Rates (AR) | |||||
|---|---|---|---|---|---|---|
| Age | 30% | 50% | 70% | Age | AR | |
| 0–4 | 30.6% | 31.0% | 30.8% | 0–4 | 29.5% | |
| 5–13 | 53.8% | 55.0% | 55.2% | 5–18 | 55.9% | |
| 14–17 | 56.0% | 57.1% | 57.3% | |||
| 18–22 | 48.9% | 49.7% | 49.7% | 19–52 | 40.8% | |
| 23–52 | 39.6% | 39.8% | 39.3% | |||
| 53–64 | 21.7% | 15.3% | 8.8% | 53–59 | 14.3% | |
| 65+ | 19.1% | 13.2% | 7.5% | 60+ | 11.0% | |
| Overall | 36.8% | 35.4% | 33.5% | Overall | 34.1% | |
1. See the discussion in [25].