How Do State Wildlife Agencies Monitor CWD Rates?

Monitoring Methods

State wildlife agencies employ various methods to monitor CWD rates, including mandatory deer harvest reporting, where hunters are required to submit their harvested deer for testing. This voluntary reporting system has been implemented in several states, such as Wisconsin, where hunters must submit a minimum of 20% of their deer for testing. Additionally, some agencies conduct targeted testing of high-risk deer populations, such as those near known CWD-positive areas or in areas with high deer densities.

Testing Methods

The most common method of testing for CWD is through a combination of immunohistochemistry (IHC) and enzyme-linked immunosorbent assay (ELISA) tests. IHC involves examining brain tissue samples under a microscope for the presence of abnormal prion proteins associated with CWD. ELISA, on the other hand, detects the presence of these proteins through a chemical reaction. Some states also use real-time PCR (polymerase chain reaction) to detect CWD prion genes in tissue samples. These tests are typically conducted by state wildlife agencies or contracted laboratories.

Data Analysis and Management

Monitoring CWD rates requires effective data analysis and management tools. State wildlife agencies use geographic information systems (GIS) to track CWD-positive deer locations and visualize the spread of the disease over time. They also use statistical models to estimate CWD prevalence and predict the number of positive deer in a given area. This information is then used to inform management decisions, such as adjusting hunting regulations or implementing targeted control measures to slow the spread of CWD.