Figure 4 is a line graph showing field vaccine effectiveness (FVE) against all ILI for the peak four weeks of ILI activity in NSW participants greater than 18 years of age, from 2007 to 2014. From 2007 to 2014 our FVE calculation for NSW participants demonstrated that the seasonal vaccine was effective in reducing the risk of ILI except in 2009 during the pandemic and in 2014. The FVE calculated for 2014 was less than the 2009 FVE estimate.