Table 2. Average annual influenza-associated mortality rates by age groups and influenza type over five seasons, England, influenza seasons 2011/12–2016/17.
| Influenza season and dominant and co-circulating subtype(s) | A | B | ||
|---|---|---|---|---|
| Influenza-attributable deaths (95% CI) | Mortality rate per 100,000 population (95% CI) | Influenza-attributable deaths (95% CI) | Mortality rate per 100,000 population (95% CI) | |
| 65–74 years | ||||
| 2011/12 | 368 | 8.0 | 428 | 9.3 |
| A(H3N2)/B | (303 to 438) | (7.0 to 9.5) | (344 to 519) | (7.5 to 11.3) |
| 2012/13 | 590 | 12.2 | 13 | 0.3 |
| A(H3N2)/B | (500 to 684) | (10.3 to 14.1) | (0 to 45) | (0.0 to 0.9) |
| 2013/14 | 16 | 0.3 | 22 | 0.4 |
| A(H1N1)pdm09 | (0–48) | (0.0 to 1.0) | (3 to 50) | (0.1 to 1.0) |
| 2014/15 | 2,378 | 46.1 | 143 | 2.8 |
| A(H3N2)/B | (2,153 to 2,611) | (41.7–50.6) | (100 to 191) | (1.9 to 3.7) |
| 2015/16 | 1,825 | 34.5 | 876 | 16.6 |
| A(H1N1)pmd09/B | (1,701 to 1,952) | (32.2 to 36.9) | (782 to 973) | (14.8 to 18.4) |
| 2016/17 | 1,828 | 33.8 | 20 | 0.4 |
| A(H3N2)/B | (1,648 to 2,014) | (30.4 to 37.2) | (0 to 71) | (0.0 to 1.3) |
| Aged 75 and older years | ||||
| 2011/12 | 3,122 | 75.5 | 3,098 | 74.9 |
| A(H3N2)/B | (2,737 to3,523) | (66.2 to 85.1) | (2,545 to 3,686) | (61.5 to 89.1) |
| 2012/13 | 6,103 | 144.9 | 1,232 | 29.2 |
| A(H3N2)/B | (5,281 to 6,964) | (125.4 to 165.3) | (838 to 1,672) | (19.9 to 39.7) |
| 2013/14a | NAa | NAa | NAa | NAa |
| A(H1N1)pdm09 | ||||
| 2014/15 | 18,680 | 427.0 | 3,626 | 82.9 |
| A(H3N2)/B | (17,657 to 19,722) | (403.6 to 450.8) | (3,105 to 4,173) | (71.0 to 95.4) |
| 2015/16 | 3,033 | 68.5 | 1,194 | 27.0 |
| A(H1N1)pdm09/B | (2,636 to 3,449) | (59.6 to 77.9) | (875 to 1,544) | (19.8 to 34.9) |
| 2016/17 | 9,628 | 215.4 | 433 | 9.7 |
| A(H3N2)/B | (8,878 to 10,399) | (198.6 to 232.7) | (175 to 759) | (3.9 to 17.0) |
CI: confidence interval; NA: not available.
aThe model could not attribute deaths for this period.