Description of the 10 study years: the date the vaccination campaign began, the characteristics of the epidemic and the control periods
| Year | Campaign start date* | Epidemic period | Control period | ||||||
| Start | End | Duration | Peak† | Serotypes‡ | Start | End | |||
| 1 | 2006/2007 | 12/10/06 | 2007 w03 | 2007 w09 | 7 | 2007 w06 | AH3N2 | 2007 w18 | 2007 w30 |
| 3 | 2008/2009 | 10/10/08 | 2008 w51 | 2009 w08 | 10 | 2009 w04 | AH3N2 | 2009 w18 | 2009 w30 |
| 4 | 2009/2010 | 01/09/09 | 2009 w37 | 2009 w52 | 16 | 2009 w49 | AH1N1 | 2010 w18 | 2010 w30 |
| 5 | 2010/2011 | 24/09/10 | 2010 w51 | 2011 w07 | 9 | 2011 w01 | AH1N1 | 2011 w18 | 2011 w30 |
| 6 | 2011/2012 | 29/09/11 | 2012 w05 | 2012 w12 | 8 | 2012 w08 | AH3N2 | 2012 w18 | 2012 w30 |
| 7 | 2012/2013 | 28/09/12 | 2012 w51 | 2013 w11 | 13 | 2013 w05 | AH1N1/B | 2013 w18 | 2013 w30 |
| 8 | 2013/2014 | 11/10/13 | 2014 w05 | 2014 w10 | 6 | 2014 w07 | AH1N1/AH3N2 | 2014 w18 | 2014 w30 |
| 9 | 2014/2015 | 16/10/14 | 2015 s03 | 2015 s11 | 9 | 2015 s06 | AH3N2 | 2015 w18 | 2015 w30 |
| 10 | 2015/20165 | 15/10/15 | 2016 s04 | 2016 s14 | 11 | 2016 s11 | B | 2016 w18 | 2016 w30 |
*Established by an official communiqué of the National Health Insurance Fund and the Ministry of Health.
†Weeks of maximum incidence.
‡Serotypes: Dominant or codominant virus types and subtypes circulating during the season. This information is based on variable numbers of samples and uses virus detection techniques of different sensitivity. Moreover, several definitions of codominance may have been used, and this information is provided as a rough guide.