Figure 5 is a line graph showing the national percentage of participants with ILI (defined as fever and cough) compared with counts of national influenza laboratory notifications for each week ending Sunday from 2009 to 2015. A similar seasonality pattern is seen in both the Flutracking ILI data and confirmed influenza notifications, with Flutracking ILI activity peaking up to four weeks earlier than confirmed influenza notifications in all years, except 2011 where confirmed influenza notifications peaked one week earlier than Flutracking ILI activity. There was an increase in the number of laboratory confirmed cases of influenza from 7,170 notifications in the peak week of 2014 to 10,678 notifications in the peak week of 2015. The peak weekly ILI percentage for 2015 Flutracking data unstratified by vaccination status was however lower (4.3%) than the peak weekly percentage for 2014 (4.7%).