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. Author manuscript; available in PMC: 2015 Mar 4.
Published in final edited form as: Epidemiol Infect. 2011 Sep 27;140(8):1439–1445. doi: 10.1017/S0950268811000987

Fig. 1.

Fig. 1

Cases by county. The number of cases per county appears in each county on the map of Iowa. The rate of cases per 1000 population is demonstrated by the shading of each county according to the legend.