NWRC researchers and partners recently completed their third year of evaluating and validating the first live rectal-tissue biopsy method for detecting chronic wasting disease (CWD) in captive and wild elk. To date, researchers have collected over 1,500 biopsies from captive elk in Colorado and used the technique to find 15 elk that were positive for CWD. As compared to proven post-mortem diagnostic tests, this live test appears to be nearly as accurate.
“The key advantage to the rectal biopsy test is that it can be performed on live animals. Until now, there was no practical live test for CWD in elk,” said NWRC's Dr. Kurt VerCauteren. “With this technique we can detect CWD in animals not showing any signs of the disease and, thus, remove them so they are not left to infect other individuals and further contaminate the environment.”
The research is a collaborative effort between APHIS' WS and Veterinary Services programs, the Agricultural Research Service, and the Colorado State University Veterinary Diagnostic Laboratory within the College of Veterinary Medicine and Biomedical Sciences. The majority of the research was conducted on the Velvet Ridge Elk Ranch, owned by Dennis and Stephanie White, near Fort Collins, Colorado. In 2002, an elk on the ranch was confirmed to have CWD and since that time the Whites have worked closely with NWRC and other collaborators to learn more about CWD and to develop methods to manage it in captive and wild settings.
“The use of this new live test in the initial screening, surveillance and monitoring of CWD will greatly aid in the management and control of the disease in the wild, as well as in captive settings,” said VerCauteren.
More studies are needed before the live rectal test can be used on a large scale.
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Evaluation and Management of Chronic Wasting Disease Transmission Research Project