Table 5.
Conversion of Medically Attended Case Fatality Ratio (CFR) to CFR for All Infected Persons Estimates Using 2 UK Studies
| Source | Measure | Parameter | Estimate | Lower Bound | Upper Bound |
|---|---|---|---|---|---|
| This study | CFR based on persons with medically attended ILI | CFRMA | 0.4% | 0.2% | 0.6% |
| Brooks-Pollock et al [28]; UK survey of healthcare-seeking behavior in adults | Probability of seeking medical care given ILI | P(ILIMA|ILI) | 0.25 | 0.25 | 0.25 |
| Hayward et al [29]; serology study | Probability of having ILI symptoms given H1N1pdm infection (based on antibody titers) | P(ILI|Inf) | 0.25 | 0.25 | 0.25 |
| Multiplying the 3 figures | CFR based on persons with influenza infection | CFRAR | 0.03% | 0.01% | 0.04% |
Abbreviations: AR, attack rate; CFR, case fatality ratio; ILI, influenza-like illness; MA, medically attended.