In the article by O'Connor BA, et al. , there was an error in the key in Figure 2. The publisher apologises for this error and Figure 2 is shown below with the correct key.
Fig. 2. Cases of Q fever by week of onset of symptoms and attendance at saleyard, November 2004–January 2005, South Australia.
O'Connor, BA, Tribe, IG, Givney, R. A windy day in a sheep saleyard – an outbreak of Q fever in rural South Australia. Epidemiology and Infection, Published by Cambridge University Press, 9 May 2014. doi:10.1017/S0950268814001083.