| Reference/study ID | Registry | |
| RNA‐based vaccine | FDA 2020b | NCT04470427 |
| Baden 2021 | NCT04470427 | |
| Walsh 2021 | NCT04368728 | |
| Thomas 2021 | NCT04368728 | |
| FDA 2020c | NCT04368728 | |
| Polack 2020 | NCT04368728 | |
| Non‐replicating viral vector | Madhi 2021 | NCT04444674 |
| Folegatti 2020 | NCT04324606 | |
| FDA 2021 | NCT04505722 | |
| Sadoff 2020c | NCT04436276 | |
| Inactivated virus | Bueno 2021 | NCT04651790 |
| Xia 2020 | ChiCTR2000031809 | |
| Formica 2021 | NCT04368988 | |
| Protein subunit | Shinde 2021 | NCT04533399 |
| Heath 2021 | NCT04583995 | |
| Heterologous schedule | Liu 2021 | ISRCTN69254139 |
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