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Table 2 Periods of active A(H1), A(H3) and B influenza virus circulation. Data were only shown for virus types and subtypes that accounted for at least 10 % of all influenza cases in that season

From: Ten influenza seasons in France: distribution and timing of influenza A and B circulation, 2003–2013

Season Period of intense influenza activity (a) Peak week (b)
A(H1) A(H3) B A(H1) A(H3) B
2003–2004 - 43–51 - - 47  
2004–2005 - 1–11 - - 5  
2005–2006 2–13 - 3–13 5 - 7
2006–2007 - 52–9 - - 5 -
2007–2008 51–8 - 2–14 4 - 8
2008–2009 - 50–6 5–15 - 3 11
2009–2010 43–52 - - 48 - -
2010–2011 50–7 - 49–8 2 - 5
2011–2012 - 3–13 - - 9 -
2012–2013 50–10 50–12 52–13 4 6 7
  1. Source: GROG influenza sentinel surveillance network, France, 2003–2004 to 2012–2013
  2. (a)Defined as the shortest period that included the peak and at least 90 % of all influenza cases caused by that virus type/subtype that occurred during that season
  3. (b)Defined as the week with the highest number of reported influenza cases of that type/subtype