One New Positive CWD Case Found in West Texas

One New Positive CWD Case Found in West Texas
Deer infected with Chronic Wasting Disease. (Photo courtesy of CWD Alliance and Wisconsin Department of Natural Resources)

AUSTIN, Texas – Chronic wasting disease (CWD) was detected in only one of 222 tissue samples that were collected from hunter harvested deer and elk from the Trans Pecos ecoregion during the 2014–15 season as part of a CWD surveillance effort. This sample was collected from a mule deer buck harvested in the Hueco Mountain area of far West Texas.

“Without the hunter check stations and the strong cooperation of hunters and landowners, we would know very little about the prevalence of the disease or where it exists,” said Mitch Lockwood, Big Game Program Director with the Texas Parks and Wildlife Department.

Also included in the sampling effort last season, 143 deer and elk brought to check stations were tested for bovine tuberculosis as part of a cooperative effort between TPWD and Texas Animal Health Commission to monitor for bovine tuberculosis. No positives were found.

To date, 839 deer and elk have been tested through the CWD check stations and strategic sampling that occurred during the summer of 2012; 282 were in the Containment Zone, 205 were in the adjacent High Risk Zone, 117 were in the Buffer Zone, and 235 were outside of the CWD zones. The disease has been detected in only 7 animals, all within the Hueco Mountain area, indicating a disease prevalence of 10–15 percent within that population.


“Additional sampling is necessary to develop more confidence in the geographic extent and prevalence of the disease, but the fact that CWD has not been detected in Texas outside of the Hueco Mountain area of northern El Paso and Hudspeth counties is encouraging,” said Lockwood.


CWD is a member of the group of diseases called transmissible spongiform encephalopathies (TSEs). Other diseases in this group include scrapie in sheep, bovine spongiform encephalopathy (BSE or mad cow disease) in cattle, and Cruetzfeldt-Jakob disease in humans. CWD among cervids is a progressive, fatal disease that commonly results in altered behavior as a result of microscopic changes made to the brain of affected animals. An animal may carry the disease for years without outward indication, but in the latter stages, signs may include listlessness, lowering of the head, weight loss, repetitive walking in set patterns, and a lack of responsiveness. CWD is not known to affect humans or livestock.


There is no vaccine or cure for CWD, but steps have been taken to minimize the risk of the disease spreading from beyond the area where it currently exists. The Texas Parks and Wildlife and Texas Animal Health commissions adopted rules to restrict movement of deer, elk, and other susceptible species within or from the CWD Zones as well increase surveillance efforts.

More details about CWD and the 2014-15 findings can be found online at:
https://tpwd.texas.gov/wildlife/diseases/chronic-wasting-disease/test-results.

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