Lyme Disease (Borrelia burgdorferi or B. mayonii)

In 2023, the Wisconsin State Department of Health estimated over 5000 surveillance case reports for Lyme Disease in Wisconsin.  Since many cases go unreported, this is an underestimate of the actual incidence of this illness.  A recent evaluation of surveillance reports and disease incidence by CDC implies that there may actually be 20-40,000+ cases of Lyme Disease in Wisconsin each year. Visit the Wisconsin Department of Health Services for more information about surveillance and disease.

Lyme Disease: Wisconsin Data

For more information on Lyme disease in your community (link is external), check out the Wisconsin Environmental Public Health Tracking Portal. Wisconsin Environmental Public Health Tracker

The incidence of Lyme disease is lower in the southern and eastern counties of Wisconsin.  This is likely related to land cover, as the deer tick is tightly linked to forested environments.  Forests and woods are less common in the lower incidence southern and eastern counties.  See the USGS website for a view of forest canopy in the state

National Land Cover Database (NLCD)

However, deer ticks are still found in these counties wherever patches of forest occur.

References

D. A. Caporale, C. M. Johnson, B. J. Millard, Presence of Borrelia burgdorferi (Spirochaetales: Spirochaetaceae) in Southern Kettle Moraine State Forest, Wisconsin, and Characterization of Strain W97F51 , Journal of Medical Entomology, Volume 42, Issue 3, 1 May 2005, Pages 457–472, https://doi-org.ezproxy.library.wisc.edu/10.1093/jmedent/42.3.457