| Study | Intervention name | Results | Unit of analysis | Time point | Type of assay | Population | |
| GMT (95% CI) | GMR (95% CI) | ||||||
| Heterologous booster versus homologous booster | |||||||
|
Li 2021a |
CoronaVac/Ad5 booster | 3090.10 (2636.10 to 3622.30) | 8.37 (6.52 to 10.75) | Not reported | 14 days after boost | ELISA | 18–59 years |
| CoronaVac/CoronaVac boost | 369 (304.20 to 447.50) | ||||||
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