Table 3 Booster dose vaccine effectiveness against VOC
VOC | No. of estimates | Pooled estimate (95% CI) | Pooled VE (%) (95% CI) |
|---|---|---|---|
Against SARS-CoV-2 infection | |||
 Delta | 4 | 0.348 (0.234, 0.517) | 65.2 (48.3, 76.6) |
 Omicron | 5 | 0.797 (0.710, 0.895) | 20.3 (10.5, 28.0) |
Against severe COVID-19 | |||
 Delta | 4 | 0.208 (0.153, 0.283) | 79.2 (71.7, 84.7) |
 Omicron | 10 | 0.127 (0.073, 0.222) | 87.3 (77.8, 92.7) |