Table 3 SARI admissions to adult ICU and adult ILI in sentinel GP surveillance during influenza epidemics
Season | Influenza epidemic (week numbers)b | Epidemic duration (weeks) | Observed SARI incidence | Standardized SARIc incidenced | Observed ILIa incidenced | Standardized ILI incidencee | Ratio of SARIc vs ILIe | Peak SARIf | ||
|---|---|---|---|---|---|---|---|---|---|---|
Weeknr | Incidencecd | Influenza strains | ||||||||
2007/2008 | 50–52 and 5–9 | 8 | 335 | 929 | 347 | 344 | 2.70 | 8 | 153 | A(H1N1) dominance followed by type B dominance |
2008/2009 | 2–6 | 5 | 379 | 731 | 476 | 511 | 1.43 | 2 | 177 | A(H3) dominance |
2009/2010 | 41–48 | 8 | 538 | 804 | 677 | 611 | 1.32 | 45 | 123 | A(H1N1)pdm09 |
2010/2011 | 1–7 | 7 | 652 | 890 | 441 | 413 | 2.15 | 1 | 162 | A(H1N1)pdm09 dominance followed by type B dominance |
2011/2012 | NA | 0 | NA | NA | NA | NA | NA | NA | NA | A(H3N2) dominance |
2012/2013 | 1–16 | 16 | 1731 | 1995 | 1328 | 1409 | 1.42 | 6 | 188 | Mixed A(H1N1)pdm09 and A(H3N2) dominance followed by B dominance. |
2013/2014 | 5–8 and 10–11 | 6 | 500 | 544 | 311 | 329 | 1.65 | 8 | 101 | Mixed dominance with slightly more A(H3N2) than A(H1N1)pdm09, low circulation of influenza B. |
2014/2015 | 49–13 and 15–17 | 20 | 2386 | 2368 | 1701 | 1764 | 1.34 | 7 | 153 | A(H3N2) dominance followed by influenza B |
2015/2016 | 53–11 | 12 | 1693 | 1693 | 1103 | 1103 | 1.53 | 6 | 176 | A(H1N1)pdm09 dominance followed by B dominance |