9129 | COV-BOOST, 2021 | 2 | 1 | 0 | excluded | risk of bias not avaialble | |
9130 | Gilboa, 2021 | 2 | 0 | 0 | excluded | risk of bias not avaialble | |
9275 | Mattiuzzi, 2022 | 2 | 0 | 0 | excluded | risk of bias not avaialble | |
9290 | Danza, 2022 | 2 | 32 | 0 | excluded | not a RCT | risk of bias not avaialble |