Figure 11: Proportion of fever and cough among FluTracking participants, May to October, 2007 to 2009, by week This figure presents the proportion of fever and cough among FluTracking participants over May to October between 2007 and 2009. From this figure, ILI (based on cough and fever) among participating community members in 2009 showed that rates of fever and cough among participants essentially peaked in mid-July at 5.2% and peaked much earlier than in 2007 and 2008.