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Table 2 Onset, end, duration and peak week of influenza season, 2006–2011. Influenza positivity rate by week and by month date

From: National Influenza Surveillance in the Philippines from 2006 to 2012: seasonality and circulating strains

Year Onset week
(Month date)
End week
(Month date)
Duration Peak week
(Month date)
2006 24 (Jun 11–17) 48 (Nov 26–Dec 2) 25 29 (Jul 16–Jul 22)
2007 25 (Jun 17–23) 43 (Oct 21–27) 19 27 (Jul 1–7)
2008 25 (Jun 15–21) 41 (Oct 5–11) 17 30 (Jul 20–26)
2010 24 (Jun 13–19) 44 (Oct 31–Nov 6) 21 33 (Aug 15–21)
2011 31 (Jul 31–Aug 6) 52 (Dec 25–31) 22 33 (Aug 14–20)
Median (week) 25 44 21 30
Range 24–31 41–52 17–25 27–33