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Tick Infection Maps

These maps show the percentage of adult and nymph Ixodes scapularis ticks (black-legged ticks) collected during 2017–2019 that were infected with Borrelia burgdorferi, the causative agent of Lyme disease. The ticks were collected in the field by the Indiana State Department of Health (ISDH) and tested at the Centers for Disease Control and Prevention (CDC). This map will be updated as ISDH continues to conduct surveillance for B. burgdorferi in ticks.

Counties colored darker blue had higher percentages of infected ticks, while counties colored lighter blue had lower percentages of infected ticks. Counties colored white had ticks collected, but none were positive. Counties colored light grey had sampling conducted, but no Ixodes scapularis ticks were found. Counties colored dark grey did not have sampling conducted during 2017–2019.

Click on a county below to see more details.

Percentage of adult Ixodes scapularis ticks infected with Borrelia burgdorferi, 2017-2019.

Percentage of nymph Ixodes scapularis ticks infected with Borrelia burgdorferi, 2017-2019.

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Page Last Updated: February 19, 2020

Page Last Reviewed: July 11, 2019