Figure 23: Rates of laboratory confirmed cases of influenza A(H1N1)pdm09, Australia, 2009, by age group and sex* This figure presents the rates of laboratory confirmed cases of influenza A(H1N1)pdm09 by age group and sex for 2009. Throughout all phases of the pandemic, the 10-14 and 15-19 years age groups had the highest cumulative population incidence rates. There was an approximately equal distribution of cases by gender overall, however there was variability across age groups.