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 a higher prevalence than yearlings and males have a higher prevalence than females.

CWD prevalence trends

The areas included in the graphs were selected based on the disease's geographic distribution and the number of deer that have been tested.

• Southcentral Iowa Area includes townships 5-6 N and ranges 2-3 E.
• Southeast Iowa Area includes townships 4-5 N and ranges 4-5 E.
• Southwest Dane Area includes townships 5-6 N and ranges 6-7 E.
• Southeast monitoring area Area includes townships 1-4 N and ranges 13-16 E.
• Southwest monitoring area Area includes townships 7-8 N and ranges 5-6 E plus portions of surrounding townships to the east, west and south.
• Northcentral Iowa Area includes townships 7-8 N and ranges 3-4 E.
• Northwest Iowa Area includes townships 7-8 N and ranges 1-2 E.
• Southeast Richland Area includes townships 9-10 N and ranges 1-2 E.
• Southwest Sauk Area includes townships 9-10 N and ranges 3-4 E.
• Baraboo-Devil's Lake Area includes townships 10-12 N and ranges 6-8 E.
• Northeast Grant Area includes townships 7-8 N and ranges 1-2 W.