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Contact information
For information on CWD, contact:
Timothy Marien
CWD wildlife biologist
Bureau of Wildlife Management

CWD prevalence in Wisconsin

Prevalence is the proportion or percentage of a population that tests positive for a disease. Chronic Wasting Disease (CWD) prevalence depends on the deer's location, sex and age. Since testing is done regionally, results can't be used to estimate the statewide prevalence.

Analyses of the geographic distribution of disease show that the disease is not evenly distributed throughout the affected area. Disease prevalence is much higher near the centers of each infection and declines with increasing distance from the center as would be expected with this introduced disease which is now endemic in southern Wisconsin.

Adult deer have higher prevalence than yearlings and males have higher prevalence than females.

  • In the southwest monitored area of Dane and Iowa counties:
    • Adult male prevalence rate has increased from 8-10 to 35 percent since 2002.
    • Adult female prevalence rate has increased from 3-4 to 15 percent.
    • Yearling male prevalence rate has increased from 2 to 13 percent since 2002.
    • Yearling female prevalence rate has increased from 2 to 10 percent.

CWD prevalence trends

Areas in the map were selected based on the disease's geographic distribution and the number of deer that have been tested. The points on the map include prevalence graphs, which show trend estimates.

The geographic information shown on these maps has been obtained from various sources, and are of varying age, reliability and resolution. These maps are not intended to be used for navigation, nor are these maps an authoritative source of information about legal land ownership or public access. Users of these maps should confirm the ownership of land through other means in order to avoid trespassing. No warranty, expressed or implied, is made regarding accuracy, applicability for a particular use, completeness, or legality of the information depicted on this map.

Last revised: Monday October 14 2019