CWD Surveillance


Each year, MDC tests a sample of the state’s deer population for CWD. CWD testing has two main goals: detect the disease as early as possible in new locations and monitor changes in disease occurrence over time.

Taxidermists throughout the state partner with MDC and collect CWD samples from hunter-harvested deer. Focusing testing on adult males increases the likelihood of finding CWD in new areas.

Within CWD Management Zone counties (counties within 10-miles of CWD detections), a greater number of samples are collected, due mostly to “mandatory sampling” on opening weekend of fall firearms season.

This important effort allows MDC scientists to better understand where the disease is on the landscape so that management actions can be applied (especially post-season targeted culling), learn about how the disease is spreading, and keep the public informed.

2022 CWD management zone map
Map of CWD Management Zone and Statewide Surveillance Zone
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2022-2023 Sampling Results to Date

The table below shows MDC sampling efforts and test results so far for the current sampling season (July 1, 2022 - June 30, 2023). These numbers are subject to frequent change.


CWD in Free-Ranging Deer

This map shows cases of CWD found so far in free-ranging deer.
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CWD Cases Found in Free-Ranging Deer Through June 30, 2022

This table shows the total number of CWD cases found in Missouri free-ranging deer by county through June 30, 2022. Positives for the current surveillance season are not included in this table.

Total CWD-positives (free-ranging deer) by County (through 6/30/2022)
County Total Positives Year of 1st Detection
Macon 57 2011-12
Adair 23 2014-15
Cole 1 2014-15
Franklin 30 2015-16
Linn 37 2015-16
Jefferson 21 2016-17
St Clair 10 2016-17
Cedar 3 2017-18
Perry 5 2017-18
Polk 8 2017-18
Ste Genevieve 50 2017-18
Crawford 1 2018-19
Mercer 1 2018-19
Oregon 16 2018-19
Stone 10 2018-19
Taney 6 2018-19
Pulaski 2 2020-2021
Putnam 3 2020-2021
Barry 4 2021-22
Howell 1 2021-22
Washington 1 2021-22
Christian 2 2021-22