Figure 3 is a column graph comparing the percentage of participants vaccinated each year from 2007 to 2015 for: 1) all participants; 2) participants working face-to-face with patients; 3) participants aged less than 10 years of age; and 4) participants aged 65 years and over. Seasonal vaccination levels were higher in 2015 than prior years for all of the comparison groups: all participants (62.5% of participants vaccinated by the final survey of 2015); those working face-to-face with patients (81.5% vaccinated by the end of 2015); participants less than 10 years of age whose parents completed a survey on their behalf (18.8% vaccinated by the end of 2015); participants aged 65 years or older (85.2% vaccinated by the end of 2015).