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Lyme Disease: Data and Statistics

From 2012 to 2022, over 1800 cases of Lyme disease were reported (Figure 1). In 2022, 236 cases of Lyme disease were reported in Indiana, for an incidence rate of 3.5 cases per 100,000 population.

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 Lyme disease.

Figure 3 (below) depicts cases of Lyme disease by county of residence.

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, 2022.

For Lyme disease tick infection maps, click here.

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