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Table 2 The influenza start weeks for each age-group. Here, we record Wednesday of that week. Except for the 2011–12 season, the 5–19 age-group starts earlier than the other age-group

From: Early detection of influenza outbreak using time derivative of incidence

  2009–10 2010–11 2011–12 2012–13 2013–14 2014–15 2015–16
0–4 2009-08-12 2010–11-24 2011-12-14 2013-01-09 2013-12-18 2014-12-24 2015-12-16
5–19 2009-08-12 2010-11-24 2011-12-21 2013-01-09 2013-12-11 2014-12-10 2015-12-16
20–64 2009-08-12 2010-12-08 2011-12-28 2013-01-09 2013-12-25 2014-12-24 2015-12-23
65+ 2009-09-30 2010-12-15 2011-12-28 2013-01-09 2013-12-25 2014-12-24 2015-12-23