Figure 24: Risk factors^ reported for confirmed influenza A(H1N1)pdm09 cases
with enhanced surveillance data (n=8,838), Australia*, 2009, by proportion# and
pandemic phase

This figure presents the risk factors reported for confirmed influenza A(H1N1)pdm09 cases
with enhanced surveillance data during 2009. The most common reported underlying
medical condition reported was chronic respiratory conditions and diabetes mellitus. During
the PROTECT phase the proportion of cases with an underlying medical condition increased
substantially to represent half of the confirmed cases during this phase, however given the
known susceptibility and focus of case ascertainment towards those at risk populations, the
increased proportion of cases reported during this phase is not unexpected.