Case/control | Crude vaccine effectiveness, % (95% CI) a | P-value | Adjusted vaccine effectiveness, % (95% CI) b | P-value | |
---|---|---|---|---|---|
All swabbed patients | |||||
Seasonal and pandemic vaccines | 2 / 19 | 91 (63; 98) | 0.001 | 87 (30; 98) | 0.017 |
Only seasonal vaccine | 11 / 26 | 65 (28; 83) | 0.004 | 64 (14; 85) | 0.022 |
Only pandemic vaccine | 4 / 7 | 53 (−62; 86) | 0.230 | 21 (−252; 82) | 0.755 |
Unvaccinated | 286 / 234 | Ref. | Ref. | ||
Influenza A(H1N1)pdm09 cases vs. controls | |||||
Seasonal and pandemic vaccines | 2 / 19 | 91 (57; 98) | 0.002 | 86 (25; 97) | 0.022 |
Only seasonal vaccine | 11 / 26 | 61 (18; 81) | 0.012 | 60 (2; 83) | 0.044 |
Only pandemic vaccine | 3 / 7 | 60 (−56; 90) | 0.187 | 53 (−132; 91) | 0.351 |
Unvaccinated | 251 / 234 | Ref. | Ref. | ||
Subjects with indication for seasonal vaccination | |||||
Seasonal and pandemic vaccines | 2 / 16 | 89 (50; 97) | 0.004 | 81 (−9; 97) | 0.062 |
Only seasonal vaccine | 10 / 21 | 58 (3; 81) | 0.041 | 50 (−38; 82) | 0.179 |
Only pandemic vaccine | 4 / 5 | 29 (−176; 82) | 0.623 | −32 (−694; 78) | 0.763 |
Unvaccinated | 72 / 64 | Ref. | Ref. |