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Know CWD website

Know CWD [exit DNR] General information about CWD in Wisconsin including common misconceptions.

Chronic wasting disease test results

Prevalence information: Prevalence is the proportion or percentage of a population that tests positive for a disease. Chronic wasting disease (CWD) prevalence is influenced by the sex and age of the deer and geographic location. Testing is conducted regionally and does not cover the whole state, as such, prevalence estimates presented are for localized areas and results cannot be extrapolated to create a statewide prevalence estimate.

To learn more about prevalence of CWD in Wisconsin study areas, view the interactive CWD prevalence map.

The average turnaround time from when the deer was brought to a sampling station to when the results were available for the 2016 season was 10 days. The average turnaround time increased to 14 days for the 2017 deer season due to a nationwide outage of testing kits at the laboratory that tests the Wisconsin wild deer.

View CWD test results for your deer

CWD testing history

Chronic wasting disease (CWD) was originally detected in Dane County in 2002. An extensive CWD surveillance program has been conducted in Wisconsin since then. Of Wisconsin's 72 counties 26 currently have CWD detected in the wild deer herd. Of the 26 counties 18 are in the southern farmland zone, 5 are in the central forest or central farmland zones and 3 are in the northern forest zone. Annual CWD detections in the southern farmland zone indicate the disease is slowly geographically expanding.

CWD results

You can search for CWD test results individually or view a summary. You will need a customer ID or CWD barcode to search for individual results. DNR adds tests results as they become available. DNR releases negative test results within a day after received. Positive test results are released as soon as DNR confirms the results and has contacted the hunter.

CWD Barcode
CWD barcode used to track deer results

CWD result maps

Recent CWD samples

Hint: Zoom in on the CWD positives by section maps to read the numbers in each section.

Total CWD samples

Hint: Zoom in on the CWD positives by section maps to read the numbers in each section.

Interactive CWD mapping application

A CWD results mapping application is available for users to explore CWD results in all areas of the state as well as create maps. This application shows harvest locations of all deer tested for CWD including the positive test results.

Tips for CWD map


The CWD map allows you to add a layer of CWD sampled deer number ranges or CWD positive deer number ranges with additional layers. The deer numbers are cumulative. Deer results will be added to the map as soon as they are made public.

Basic tools

map layers Map layers – By clicking show layers you can choose what layers will show on the map. The legend will show the layers chosen as well as give the number ranges for the CWD results. In order to save a copy of the map you need to log in. Otherwise it is not necessary.

print Printing and saving – Clicking print/save PDF map allows you to create a PDF map. You will be able to add a title and notes and center the map as desired.


measure Measurement tools – Distances or areas can be measured in different units such as miles or kilometers. One possible use could be how far a parcel of land is from a CWD positive.

find locations Find location – To find a specific township/range/section, county or city the find data tool can be used.

identify Identify – The identify tools can be used to obtain additional information on map features. If the identify tools are used to click on a CWD result range the number of samples collected, analyzed and positive will be displayed.

coordinate Coordinate tools – Can add points to specific latitude/longitude values or click a point on the map to get the latitude/longitude values. When adding coordinates the direction, N or W is required.


drawings Drawing – Text or shapes can be added to the map. To edit an item added to the map, click edit and then click on the item to be edited. Drawing can be erased one at a time or all at the same time.

Note: web browser requirements

To use these interactive maps, you will need Internet Explorer 8 or higher with the Microsoft Silverlight plug-in. If you do not have the Silverlight plug-in installed, Internet Explorer will prompt you to install it.

  • Browsers Google Chrome (starting with version 45) and Microsoft Edge do not support Silverlight and these interactive maps will not work with these browsers.
  • Windows 10 users with Microsoft Edge can choose to view this site with Internet Explorer 11. Open Internet Explorer from the “Tools” menu of Edge.
  • Google Chrome version 44 and lower support the Silverlight plugin.
Contact information
For information on CWD results, contact:
Erin Larson
CWD data coordinator
Bureau of Wildlife Management
Last revised: Tuesday April 16 2019