Table 3.
Depiction of the comparative vaccine effectiveness against any influenza (A + B) and influenza B in the 2019-2020 season reported from other geographic locations.
| Site | Influenza-Positive | Influenza-Negative | Adjusted VE, % (95% CI) | ||
|---|---|---|---|---|---|
| Total | Vaccinated | Total | Vaccinated | ||
| N | N (%) | N | N(%) | ||
| European Union [27] | |||||
| EU (PC) Influenza B |
12 | 4 (NC) | 313 | 199 (64) | 60 (−69 to 90) |
| Influenza B/Victoria | 209 | 5 (2) | 1190 | 141 (12) | −12 to 86 |
| EU (H) Influenza A |
122 | 50 (41) | 473 | 312 (66) | 62 (41 to 76) |
| United States [29] | |||||
| All influenza types | 1060 | 390 (37) | 3052 | 1682 (55) | 45 (36–53) |
| Influenza B/Victoria | 634 | 211 (33) | 2968 | 1641 (55) | 50 (39–59) |
| Influenza A(H1N1)pdm09 | 336 | 138 (42) | 3052 | 1682 (55) | 37 (19 to 52) |
| Canada [28] | |||||
| All influenza types | 1411 | 191 (14) | 1397 | 399 (29) | 58 (47 to 66) |
| Influenza A | 731 | 131 (18) | 1397 | 399 (29) | 49 (34 to 60) |
| Influenza B | 683 | 60 (9) | 1397 | 399 (29) | 69 (57 to 77) |
| Present study | |||||
| Any influenza (A + B) | 336 | 23 (7) | 883 | 76 (9) | 14 (−41 to 47) |
| Influenza B/Victoria | 163 | 14 (9) | 883 | 76 (9) | −12 (−106 to 39) |
EU = European Union; PC = primary care setting; H = hospital setting.