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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