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| Outcome or subgroup title | No. of studies | No. of participants | Statistical method | Effect size |
|---|---|---|---|---|
| 5.1 Viral illness | 3 | Risk Ratio (IV, Random, 95% CI) | Subtotals only | |
| 5.1.1 Influenza‐like illness | 3 | 2982 | Risk Ratio (IV, Random, 95% CI) | 1.03 [0.69, 1.53] |
| 5.1.2 Laboratory‐confirmed influenza | 3 | 2982 | Risk Ratio (IV, Random, 95% CI) | 0.99 [0.69, 1.44] |
