Table 1 Primary series vaccine effectiveness against VOC
VOC | No. of estimates | Pooled estimate (95% CI) | Pooled VE (%) (95% CI) |
|---|---|---|---|
Against SARS-CoV-2 infection | |||
 Alpha | 2 | 0.280 (0.062, 1.273) | 72.0 (− 27.3, 93.8) |
 Gamma | 7 | 0.558 (0.514, 0.606) | 44.2 (39.4, 48.6) |
 Delta | 26 | 0.472 (0.393, 0.567) | 52.8 (43.3, 60.7) |
 Omicron | 9 | 0.836 (0.772, 0.905) | 16.4 (9.5, 22.8) |
Against severe COVID-19 | |||
 Alpha | 5 | 0.160 (0.059, 0.430) | 84.0 (57.0, 94.1) |
 Gamma | 7 | 0.267 (0.202, 0.353) | 73.3 (64.7, 79.8) |
 Delta | 31 | 0.306 (0.254, 0.369) | 69.4 (63.1, 74.6) |
 Omicron | 14 | 0.340 (0.299, 0.386) | 66.0 (61.4, 70.1) |