Figure 4 - This figure shows all notified cases of IPD in non-Indigenous Australians aged 65 years or older in Australia between 2007 and 2017 by quarter and the serotype causing disease, grouped according to targeted vaccines. The figure shows that overall rates of IPD have declined amongst this population since 2012, although there has been a recent increase in cases, especially due to non-vaccine serotypes. Disease due to serotypes targeted by the 13vPCV has reduced substantially in this population group likely due to herd immunity impacts from the childhood immunisation program.