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| Outcome or subgroup title | No. of studies | No. of participants | Statistical method | Effect size |
|---|---|---|---|---|
| 4.1 Viral illness | 6 | Risk Ratio (IV, Random, 95% CI) | Subtotals only | |
| 4.1.1 Influenza‐like illness | 6 | 4504 | Risk Ratio (IV, Random, 95% CI) | 1.03 [0.77, 1.37] |
| 4.1.2 Laboratory‐confirmed Influenza | 4 | 3121 | Risk Ratio (IV, Random, 95% CI) | 0.97 [0.69, 1.36] |
