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Rocky Mountain spotted fever: Data and Statistics

In 2017, 94 cases of Rocky Mountain spotted fever (RMSF) were reported in Indiana, for an incidence rate of 1.41 cases per 100,000 population. For the five-year reporting period from 2013 to 2017, 232 cases of RMSF were reported, with one death reported in a pediatric patient (Figure 1). While the disease is most common in the spring and summer months when ticks are active, RMSF can occur anytime during the year (Figure 2). RMSF can occur in all areas of Indiana, but most cases occur in the southern part of the state. People who live in or travel to this part of the state are at increased risk for developing RMSF. Figure 3 depicts cases of RMSF by county of residence.

Figure 1. Rocky Mountain Spotted Fever Cases by Year — Indiana, 2013–2017

Figure 2. Rocky Mountain Spotted Fever Cases by Month of Illness Onset – Indiana, 2017

Figure 3. Rocky Mountain Spotted Fever Case Counts by County of Residence – Indiana, 2017


NOTE: These data include confirmed and probable cases according to national surveillance case definitions adopted by the Council of State and Territorial Epidemiologists (CSTE). The RMSF case definition may be found here. All rates are calculated per 100,000 population based on the U.S. Census Bureau’s population estimates as of July 1, 2017, obtained on July 10, 2018.

For prior years’ RMSF statistics, please visit our annual report pages.


Page Last Updated: September 7, 2018

Page Last Reviewed: September 7, 2018