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Lyme Disease: Data and Statistics

In 2018, 155 cases of Lyme disease were reported in Indiana, for an incidence rate of 2.3 cases per 100,000 population. For the five-year reporting period from 2014 to 2018, 706 cases of Lyme disease were reported (Figure 1). While the disease is most common in the spring and summer months when ticks are active, Lyme disease can occur anytime during the year (Figure 2). Lyme disease can occur in all areas of Indiana, but most cases occur in the northwest part of the state. People who live in or travel to this part of the state are at increased risk for developing Lyme disease. Figure 3 depicts cases of Lyme disease by county of residence. Figure 4 depicts cases of Lyme disease by the county of likely exposure as determined by public health investigation. This does not include people who reported an unknown county of likely exposure or likely exposure in other states.

For Lyme disease tick infection maps, click here.

Figure 1. Lyme Disease Cases by Year — Indiana, 2014–2018

Figure 2. Lyme Disease Cases by Month of Illness Onset – Indiana, 2018

Figure 3. Lyme Disease Case Counts by County of Residence – Indiana, 2018

Figure 4. Lyme Disease Case Counts by County of Likely Exposure – Indiana, 2018

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 Lyme disease case definition may be found here. All rates are calculated per 100,000 population based on the U.S. Census Bureau’s population estimates for July 1, 2018, based on Census 2019 data estimates.

For additional county level statistics for Lyme, please visit our Stats Explorer page.

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

Page Last Updated: November 5, 2020

Page Last Reviewed: November 5, 2020