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South Williamsport, PA
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The Roving Sportsman… Chronic Wasting Disease

It was not that long ago that we heard about Chronic Wasting Disease (CWD) occurring somewhere out west, but never considered that it would ever become a concern within our own borders here in Pennsylvania. Initially, reports were of limited outcroppings of the disease in deer and elk in a few of the western states,

It was not that long ago that we heard about Chronic Wasting Disease (CWD) occurring somewhere out west, but never considered that it would ever become a concern within our own borders here in Pennsylvania. Initially, reports were of limited outcroppings of the disease in deer and elk in a few of the western states, but all that has changed as the disease has slowly marched eastward and has gained a foothold in our state.

The precise location and first occurrence of CWD are not known, but the disease first noted in 1967 in research mule deer herds in Colorado. By the late 1970s, CWD was recognized in captive facilities in Colorado and Wyoming in mule deer, black-tailed deer, and elk. In 1981, the disease was identified first in the wild in elk in Colorado, followed by mule deer in 1985 in both Colorado and Wyoming. CWD spread to captive herds in Saskatchewan, Canada in the mid-1990s, then to wild cervids by the year 2000.

In 2001, CWD was identified in white-tailed deer in South Dakota wild herds and in a captive herd in Nebraska. In years following, the spread reached Minnesota, Wisconsin, New Mexico, Utah, Illinois, Kansas, Virginia, North Dakota, Iowa and finally reached Pennsylvania in 2012. Today, CWD has been confirmed in 23 states and two Canadian provinces.

While CWD was first detected in mule deer, it was thought that transmission to other cervids was not possible, but shortly after that, it was discovered in elk. Today, it has been reported in white-tailed deer, mule deer, moose, elk, and black-tailed deer.

Most cases of CWD occur in adult animals, are progressive and are always fatal. Initial signs of the disease are difficulties in movement, followed by an obvious and consistent weight loss over time. Excessive salivation and grinding of the teeth have also been observed. Increased drinking and urination happens, which may contribute to the spreading of the disease.

CWD is caused by a prion — an abnormal form of a normal protein that is most commonly found in the central nervous system but can spread to the peripheral nervous system, thus infecting meat, or muscle, of deer and elk. Research indicates that prions can be excreted by deer or elk, and are transmitted by eating grass growing in contaminated soil. An infected deer’s saliva can spread the CWD prions; thus exposure between animals is associated with the sharing of food and water sources contaminated with CWD prions shed by diseased animals.

Hunters are advised to use standard precautions around animals, such as shooting only healthy-appearing animals, wearing rubber gloves for field dressing and washing hands and forearms thoroughly. When processing the carcass, wear rubber or latex gloves and eye protection. Avoid cutting through the skull or spinal cord and use separate dedicated knives, saws and cutting boards for butchering deer.

Although no current evidence links CWD to human health, it is recommended that people do not consume, distribute or donate for human consumption a known or suspect CWD positive animal.

Since its initial discovery in Pennsylvania in 2012, the numbers of reported cases of CWD have been increasing. In 2016, 25 free-ranging deer were positively identified as infected with CWD. In 2017, 78 free-ranging deer were detected in Pennsylvania — more than three times the previous year.

Seventy-Five of the free-ranging positives were within, or near the boundaries of Disease Management Area 2 (DMA 2) in southcentral Pennsylvania and the other three were within or near DMA 3, in northwestern Pennsylvania. DMA 4 has been added this year in the Lancaster County area to help combat and monitor the spread of CWD.

Currently, it is illegal to feed deer within the DMAs. Hunters are prohibited from transporting high-risk deer parts (generally the head and backbone) from deer they have taken within a DMA to points outside the DMA. Further, the use or field possession of urine-based deer attractants also is prohibited within DMAs.

While we once looked at CWD as a problem that only occurred “out west,” it has taken a foothold within our state and continues to spread. As sportsmen, we must pay close attention to this threat and comply with current regulations to do our part in helping stem the expansion of this disease. Take time to become familiar with the signs the infected animals display and use common sense precautions in handling any animal or carcass that might be CWD-positive.

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