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. 2016 Jan 6;94(1):35–42. doi: 10.4269/ajtmh.15-0580

Figure 1.

Figure 1.

Historical incidence rate and case fatality rate of spotted fever group rickettsiosis in the United States, 1920–2013 (2013 CDC unpublished data).3,8 The two measures are negatively correlated (Spearman's ρ = −0.37, P = 0.001).