The wasting disease is a fatal disease of deer (deer, elk, and moose), which affects the brain and the nervous system of the infected animals, as occurs with other diseases that affect the nervous system as is the case of the canine distemper. 

The symptoms include weight loss and behavior changes that include apathy, head low and ears falls. Those who hunt in an area that is positive for cachexia chronic (CWD) can lead to the deer or elk captured the offices of DWR in Salt Lake, Ogden, and Vernal to perform tests.

What is CWD?

The cachexia of chronic or CWD (its abbreviation in English) is a progressive disease and fatal disease that affects members of the deer family, called deer. He is a member of the group of diseases known as transmissible spongiform encephalopathies or prion diseases. The cachexia of chronic affects the nervous system of a cervids and as its name suggests, it causes wear and tear of body tissues.

The cachexia of chronic has been found in deer mule, white-tailed deer, moose and elk and wild in the united States and two canadian provinces. It has also been detected in herds of elk farm in the united States and Canada.

Scientists believe that a protein normally found in the brain of an animal becomes abnormal, and plays. The result is that the brain tissue is destroyed gradually and the animal dies. The disease is always fatal in animals that are infected. The cachexia of chronic has been found in deer of all age groups, including young animals and females, but is more common in larger animals.

The symptoms of CWD appear slowly, but usually do not appear until the animal is very advanced in the disease. Eventually, the animal loses weight, has difficulty moving, he becomes listless and depressed and starts to drool. Other symptoms include a change in posture, head down, and loss of coordination.

If signs of CWD, the animal must be sacrificed. This prevents the spread of the disease and allows to carry out tests and a follow-up to best of the herd.

MDIFW is working to reduce the chances that you find CWD in Maine and to monitor outbreaks. To that end, we surveyed a representative sample of all the state-of-the harvest of deer and elk every year, we send these samples to the Veterinary Diagnostic Laboratory of Utah State University (UVDL) in Logan, where are tested for CWD using the immunohistochemistry method “gold standard”.

We encourage hunters to report any sighting of deer or elk that look sick, even if the animal is not dead. It is important to keep track of the places where you can see these animals, as a single herd infected can affect a wide area.

How is a diagnosis of cachexia chronic?

Regarding chronic wasting is diagnosed based on the presence of an abnormal protein specific of the disease, called PrPSc. This abnormal protein is partially resistant to digestion with proteases and accumulates in neurons of the affected animals. This buildup causes changes spongiform encephalopathy in the brain and a series of neurological symptoms such as behavioral changes, excessive drooling, weight loss, lack of coordination, wasting, inability to stand, hyper-salivation, grinding of teeth, and the inability to maintain the head in a normal position. The symptoms of CWD progress in a consistent manner from the early stage until the last of the disease and eventually lead to death.

The cachexia of chronic like many other transmissible spongiform encephalopathies (TSES) and is classified as a neurodegenerative disease of the central nervous system (CNS). During the post-mortem examination, found lesions in the grey matter of the spinal cord, the diencephalon, and both cortices, cerebellar. These lesions are bilaterally symmetrical and anatomically constant from infected animals. 

The lesions have a look spongiform and are surrounded by vacuoles. Staining with H&E sections of the brain demonstrates hyperplasia astrocítica, as well as areas eosinofílicas of the neuropil with appearance spongiform and spongy texture.

As a result of these pathological changes, the brain cells begin to decay and degenerate, which leads to apoptosis or cell death in the deer affected. The infectious agent is transmitted to other deer by direct contact, ingestion of carcasses contaminated and maternal transmission to the fetus. It has been shown that the fetuses of pregnant mothers infected with CWD have a high rate of contagiousness and presented a progression of the disease similar to that of the deer adults.

The only way to confirm a suspected case of CWD is to analyze samples from brain and lymph nodes of a deer or moose affected individually. Samples of brain and lymph nodes must be obtained from the correct location in the animal, namely, the region obex of the brain in the deer mule, or of the lymph nodes retropharyngeal medial to the moose. The tissue must be sent to a laboratory approved by the federal government for analysis.

The Resources Department of Fisheries and Wildlife of Kentucky is working to prevent the spread of the cachexia of chronic among the herds of deer and elk in the wild. It is important that all the hunters know where it has been found cachexia, chronic, and the flocks are affected by it. It is also important that all hunters are diligent in their hunting practices to make sure not to catch infected animals.

What are the symptoms of cachexia chronic?

Regarding chronic wasting disease is a progressive and fatal disease of the nervous system of deer (members of the deer family), including white-tailed deer, deer mule, and the moose. It is part of a group of diseases called Transmissible spongiform Encephalopathies (tses) or ' prion diseases”. 

Unlike diseases and bacterial infections in animals and viruses, prions do not die or are inactivated by heat, freezing, disinfectants, chemicals or other environmental factors, normal. Prions are very resistant and can survive for long periods of time in the environment, therefore, it is difficult to control the spread of the cachexia of chronic and other prion diseases.

The symptoms of cachexia chronic in deer and elk start slowly with changes in behavior, such as tripping, not standing up straight, tremors, loss of coordination, and/or drooling. In the course of the disease, affected animals become emaciated and suffering from loss of weight, lose their appetite, which makes you very sick and die from aspiration pneumonia or other causes, such as predation, natural death, or vehicle collisions.

A deer, the prion that causes CWD accumulates first in the lymph nodes retropharyngeal medial and then travels to the brain, where it creates the injuries encephalopathies that are the classic symptoms of the disease. In the lift, the prion accumulates in the brain area known as region obex of the medulla oblongata.

Currently, there is no treatment or vaccine for the cachexia, and chronic and can only be detected by analyzing a sample of the central nervous system and/or the lymph nodes of the animal; it can use a variety of tests, but the most reliable method is immunohistochemistry using antibodies special to recognize the abnormal prion protein in the brain and lymph nodes. 

We will need samples of the lymph nodes retrofaríngeos (membranous) medial and region of the obex of the brain to the test procedure. These samples were sent to the Veterinary Diagnostic Laboratory of Utah State University (UVDL) for analysis. The UVDL has been approved by the National Laboratory of Veterinary Science to perform this test. NDOW also has test kits portable available for hunters to use in the field.

How do I know if my deer or moose has cachexia chronic?

The infected animals, especially deer, are sick or emaciated. Can stand with a posture exaggeratedly wide, staggering or having difficulty keeping your head up, display excessive salivation and drink and urinate a lot more than normal. Over time, these signs lead to a gradual weight loss, inability to maintain body condition (fat and muscle) and a state mental deterioration, all of which leads to emaciation, starvation and death.

The wasting disease is a fatal neurological disease of deer americans (deer, elk, moose), including white-tailed deer in captivity and in freedom. Part of a family of diseases known as transmissible spongiform encephalopathies, or TSES. The mutated protein that causes the CWD is similar to the prion responsible for scrapie in the domestic sheep and bovine spongiform encephalopathy, or the mad cow disease in the cattle. However, there is no evidence that the cachexia of chronic can be transmitted from deer to cattle, or to the people.

There is No vaccine for the cachexia of chronic or treatment. If you have concerns about possible exposure to the prion, contact your local health department or a doctor of public health.

ODFW has begun a comprehensive plan to prevent the spread of CWD in our areas of wildlife management. The plan involves working with taxidermistas and processors trade of meat to encourage them to take samples from CWD when they process a deer or elk, develop rules for the safe disposal of animal waste, which may carry the prion CWD (the brain, spinal cord, and lymph nodes), and communicate accurate information about the disease to the hunters and the general public.

In addition to our efforts to prevent the spread of the disease, the ODFW is monitoring the populations of deer through field studies and laboratory tests to detect the presence of the prion form. The best way to help us to detect the disease is that the athletes make their deer or elk hunted or killed on the road are examined to detect CWD. 

We will be operating inspection stations, wildlife during certain hunting seasons in the fall to collect these samples. For more information on how to notify cases of cachexia, chronic, visit the web page of the ODFW the program of surveillance of CWD. In addition, the regulations of the importation of deer and elk of Washington have been updated recently to include specific restrictions for animals with CWD-positive.