Chronic Wasting Disease

Chronic wasting disease (CWD)

Chronic wasting disease (CWD) is a disease of the nervous system in deer and elk that results in distinctive brain lesions. It continues to be a major issue for wildlife scientists throughout the Nation.

Weekly CWD Status Update – Updated 6/23/2017— nine wild deer tested positive for CWDcwd3-16


Fire May Be the Only Remedy for a Plague Killing Deer and Elk, New York Times, June 26, 2017Once chronic wasting disease gets a foothold, it can spread relentlessly. It’s now documented in 24 states, and continues to expand into new ranges. In some herds, as many as half of the animals carry prions. It’s only been in recent years that scientists have gained crucial clues to how the disease spreads. Direct contact, it turns out, isn’t the only way that the prions get from one animal to another. Sick animals and cadavers spread prions across the landscape. Plants and soil may remain coated with deformed proteins for years, perhaps even decades. Dr. Zabel now suspects that the only way to rid the land of them is to set controlled fires.

2017 North American Deer Summit: CWD Is Worse Than We Thought, Realtree.com, June 9, 2017Several challenges arise with the big issue of CWD. First, we’re met with the challenge of detecting it. We don’t fully understand how it mutates (and science has proven that it can mutate). We have no cure. It’s killing deer throughout half the country and rapidly spreading. Managing it has been near to impossible. Too many people are brushing it under the rug. And funding we currently have for research, testing and management are pennies in comparison to what’s needed to defeat this disease.

Can Michigan save deer from this deadly disease?, Lansing State Journal, May 25, 2017Unchecked, chronic wasting disease has the potential to wipe out half or more of Michigan’s deer herd in heavily infected areas, disrupting the state’s $2.3 billion hunting economy. That’s the worst-case scenario. It’s already playing out in Wyoming, one of the first states to discover the disease in wild deer. A 2015 study projected that it could cause extinction of the Wyoming mule deer herd within 41 years.

Elk and deer herds in danger decades after disease discovery, Billings Gazette, May 17, 2017After decades of work, wildlife managers are, in some ways, starting over in figuring out how to manage the disease. The Centers for Disease Control and Prevention still don’t recommend humans eat an infected animal, but there have been no cases of transmission. Nor did the disease initially tear through herds as quickly as first predicted. But that’s all starting to change. New models are showing that in the long term, mule deer numbers, particularly in central Wyoming, could plummet. Instead of raging through like an ancient plague, the disease kills slowly, taking years or even a decade, and spreading in ways no one quite understands. So Wyoming wildlife managers and researchers are regrouping, working at ground zero with new information and seeking input from the public as they race to grasp the full impact of — and possible solution to — one of the most deadly wildlife diseases facing the state.

25 wild deer test positive for chronic wasting disease, 27News.com, May 15, 2017 The Pennsylvania Game Commission says 25 wild deer have tested positive for chronic wasting disease in an area of the state where other wild deer have been found to have the fatal disease since 2012.

Study Shows How Chronic Wasting Disease Spreads in Wisconsin, USNews, April 21, 2017The disease has been found in more than 40 of Wisconsin’s 72 counties since the first confirmed cases in 2002. Richgels said it remains a threat throughout Wisconsin and that hunters should consider having their deer tested for the disease.

Chronic Wasting Disease, Texas A&M, April 11, 2017

Showcasing the DNR: Task force working on CWD prevention efforts in UP, DNR, March 2, 2017With the potential threat of chronic wasting disease spreading to the Upper Peninsula from across the Wisconsin border, or by other means, the Michigan Department of Natural Resources, hunter groups and others are working cooperatively to try to protect the region’s deer population and valuable hunting tradition. Previous studies showed CWD prions (infectious agents made from protein material) exist in the saliva, urine, blood and feces of infected animals.

Molecular Mechanisms of Chronic Wasting Disease Prion Propagation [abstract], Perspectives in Medicine, Feb 13, 2017The etiology of chronic wasting disease (CWD), a relatively new and burgeoning prion epidemic in deer, elk, and moose (members of the cervid family), is more enigmatic. The disease was first described in captive and later in wild mule deer and subsequently in free-ranging as well as captive Rocky Mountain elk, white-tailed deer, and most recently moose. It is therefore the only recognized prion disorder of both wild and captive animals. In addition to its expanding range of hosts, CWD continues to spread to new geographical areas, including recent cases in Norway. The unparalleled efficiency of the contagious transmission of the disease combined with high densities of deer in certain areas of North America complicates strategies for controlling CWD and raises concerns about its potential spread to new species.
State says Mecosta County deer cull could begin by end of the week, MLive, Feb 2, 2017The Michigan Department of Natural Resources could test the remains of as many as 3,000 deer within a nine-township area over the next year after two farm-raised deer in Mecosta County tested positive for Chronic Wasting Disease (CWD) last month. The plan includes deploying sharpshooters to cull some deer in specific spots where CWD-positive deer were found.

Chronic wasting turns up in another SE Minnesota deer, MPR News, Jan 23, 2017The latest case was an adult female, killed near Preston, Minn., very close to where four other infected animals discovered, the Minnesota Department of Natural Resources said Monday. It brought to six the number of wild deer testing positive in southeastern Minnesota. Results are still pending on more than 100 samples.

Chronic Wasting Disease found at Mecosta County deer farm, Lansing State Journal, Jan 20, 2017The discovery of chronic wasting disease at a Mecosta County deer farm means state wildlife officials now have to fight the fatal disorder on two fronts. Nine wild deer killed in Ingham and Clinton counties have tested positive for the disease, the DNR said. The mandatory testing zone now includes 17 townships in Clinton, Eaton, Ingham and Shiawassee counties.

The deer farm where the infected animals lived will be quarantined and depopulated, state officials said. There also will be testing, fence inspections and audits of all deer farms within a 15-mile radius, as well as testing of free-ranging deer in the area.

2 More Deer Found With CWD, 5 County Feeding Ban In Place, CBS Local.com, Jan 10, 2017Wildlife managers have found two more deer suspected of being infected with chronic wasting disease near the southeastern Minnesota town of Preston, raising the number of confirmed and presumptive infected deer found in the area to five. The does were killed within a mile of where the first two deer that tested positive were shot in November, marking the first appearance of the brain disease in wild deer in Minnesota since 2010. The Department of Natural Resources expects confirmation later this week.

Third CWD-infected deer found in SE MN; special hunt starts Saturday, Kare11News, Dec 28, 2016Tuesday, the Minnesota Department of Natural Resources announced that a third deer was found infected with CWD. A hunter harvested the deer in mid-November. Around that same time, two other deer were killed that later tested positive for CWD about 4 miles west of Lanesboro. The third deer was killed about 5 miles north of the other two in southeastern Minnesota.

Suspect CWD deer harvested in Eagle Township, Clinton County, Statewide DNR News, Nov 22, 2016A 1.5-year-old buck taken Wednesday, Nov. 16, in Clinton County’s Eagle Township is likely the ninth free-ranging deer in Michigan to test positive for chronic wasting disease (CWD).

Video: Testing Deer for CWD, MDNR, Nov 10, 2016Have you ever wondered how deer are tested for Chronic Wasting Disease (CWD)? This short video walks you through the process.

Michigan continues to battle chronic wasting disease, MDNR, Nov 3, 2016Cases of disease fatal to white-tailed deer located in south central Michigan. The discovery of an eighth free-ranging Michigan white-tailed deer with chronic wasting disease this summer was a disappointment to Michigan Department of Natural Resources wildlife officials.

Eighth Michigan deer likely to test positive for chronic wasting disease, MLink, Sept 12, 2016A 3½-year-old buck from Meridian Township is likely to be the eighth deer to test positive for chronic wasting disease, according to the state Department of Natural Resources.

Suspect deer for chronic wasting disease identified in Ingham County, Statewide DNR News, Sept 12, 2016 3.5-year-old buck taken recently in Meridian Township is likely to be the eighth positive and the first discovered since March of this year. The sample is currently being tested by the U.S. Department of Agriculture’s National Veterinary Services Laboratory in Ames, Iowa, to finalize confirmation. “This latest suspect positive reinforces the notion that the disease is still occurring in Meridian Township and perhaps elsewhere,” said Chad Stewart, DNR deer specialist. “We are counting on hunters to bring their deer in for testing so we have a better understanding about the scope of the disease.”

Court says Missouri can’t ban deer imports over fears of disease, LakeExpo.com, Sept 17, 2016A state judge ruled this week against a ban on importing deer from other states to Missouri, a rule the state Department of Conservation had tried to impose to keep chronic wasting disease in check. The judge said that rules already in place by the Missouri Department of Agriculture go far enough to keep tabs on the risk of chronic wasting disease. His order said the Missouri Department of Conservation’s attempt to lock out deer from other states poses too great a danger to the captive deer industry and its ability to offer customers the trophy bucks they seek.

Researchers document first-ever evidence of white-tailed deer declines from CWD, Phys.org, Sept 2, 2016The research, led by recent UW Ph.D. graduate David Edmunds, under the direction of Associate Professor Todd Cornish in the Department of Veterinary Sciences, is the first conclusive evidence that CWD found at high prevalence leads directly to population declines in free-ranging deer populations. “The decline was caused directly by CWD lowering annual survival of female deer, which have the biggest impact on population growth rates,” Edmunds says. “This was because CWD-positive deer died both directly from the disease and were more likely to be killed by hunters than CWD-negative deer.”

Chronic Wasting Disease in White-tailed Deer: Infection, Mortality, and Implications for Heterogeneous Transmission, Ecology, July 2016We used epidemiological models to estimate the force-of-infection and disease-associated mortality for white-tailed deer in the Wisconsin and Illinois CWD outbreaks. Models were based on age-prevalence data corrected for bias in aging deer using the tooth wear and replacement method. Both male and female deer in the Illinois outbreak had higher corrected age-specific prevalence with slightly higher female infection than deer in the Wisconsin outbreak. Corrected ages produced more complex models with different infection and mortality parameters than those based on apparent prevalence. We found that adult male deer have > 3 fold higher risk of CWD infection than female deer. Males also had higher disease mortality than female deer. As a result CWD prevalence was 2 fold higher in adult males than females. We also evaluated the potential impacts of alternative contact structures on transmission dynamics in Wisconsin deer. Results suggested that transmission of CWD among male deer during the nonbreeding season may be a potential mechanism for producing higher rates of infection and prevalence characteristically found in males.

Southwest Colorado gets first deer infected with wasting disease, The Journal, July 12, 2016Colorado Parks and Wildlife says that it has found a deer that was infected with chronic wasting disease just east of Montrose, the first time that an infected deer has been found in Southwestern Colorado, a state Parks and Wildlife official said on Tuesday.

Fatal deer disease impacts Ionia County, Sentinel Standard, July 5, 2016Ionia County was placed in the deer chronic wasting disease management zone Tuesday by the Michigan Department of Natural Resources. Department of Natural Resources deer specialist Chad Stewart said seven deer in Michigan have tested positive for CWD. However, no deer found in Ionia County have tested positive for the disease. The reason for the expanded management zone is because three of the diseased deer were found in south Clinton County, which neighbors Ionia County.

Female deer disperse farther than males, present disease-control challenge, Science Daily, June 28, 2016“Dispersal of female deer is density dependent, meaning that higher deer densities lead to greater dispersal rates.” He explained. “Therefore, reducing deer density will reduce female dispersal rates — and likely will reduce disease spread. Containing the spread of chronic wasting disease is going to be difficult when female deer disperse.

Illinois is shining star in fight against deer disease, rrstar.com, June 19, 2016Laroche said targeted removal might be more effective than issuing permits to let hunters kill more deer in areas where the disease has been found. Another idea, which he admitted might sound strange, is to fence land to prevent diseased deer from migrating. Wisconsin hasn’t used targeted removal and the disease is more prevalent there than in Illinois, although the outbreaks in both states began in 2002.icials are revisiting that plan.

TPWD merits support in fight against chronic wasting disease, MySA.com, June 19, 2016The fairest way to deal with the threat of chronic wasting disease is not to expose the rest of the state’s wild deer herd to this fatal disease, but instead to take all necessary steps to control and limit the spread before it is too late.

Pa. Game Commission looks into targeted removal for diseased deer, Citizen’s Voice, June 7, 2016 The method called targeted removal seems to keep the prevalence of chronic wasting disease to around 1 percent in Illinois, Wayne Laroche, the director of wildlife management, told the commissioners during their working group meeting in Harrisburg on Monday. Laroche said targeted removal might be more effective than issuing permits to let hunters kill more deer in areas where the disease has been found. Another idea, which he admitted might sound strange, is to fence land to prevent diseased deer from migrating. Wisconsin hasn’t used targeted removal and the disease is more prevalent there than in Illinois, although the outbreaks in both states began in 2002.

AGFC Needs Hunters To Hunt To Manage Spread Of Deadly Deer Disease, KFSM, May 26, 2016“We need those hunters to go out there and harvest those deer,” Stephens said. “We need to get the deer densities down. We need to spread it out so that those deer are not infecting other deer when they are so close together. We really need the public’s help, especially hunters.”

Michigan expands deer chronic wasting disease test zone, Detroit Free Press, May 20, 2016The area has been enlarged from nine townships to 17 in Clinton, Eaton, Ingham and Shiawassee counties. Successful hunters in the area will be required to take their deer to a DNR check station for testing.

Decision time nears for CWD outbreak in wild Pennsylvania deer, Outdoor Newd, May 16, 2016The Wisconsin Department of Natural Resources in 2010 ended its effort to thin the deer herd in infected areas after growing public backlash. The agency’s plan since then has been to only monitor the disease with no attempts to control its spread. But now that strategy appears on the verge of costing Wisconsin’s economy billions of dollars. The Wisconsin whitetail population is being decimated by CWD – and it is now spreading even more quickly.

Seven new cases of chronic wasting disease found in Missouri deer, KY3.com, April 23, 2016The Missouri Department of Conservation (MDC) received final results from its 2015‐2016 fall and winter testing of nearly 7,700 free‐ranging deer for Chronic Wasting Disease (CWD). Seven were confirmed to be positive for the fatal deer‐disease. The new cases bring the total number of Missouri free‐ranging deer that have tested positive for CWD to 33 since the disease was first discovered in the state in 2010.

A contagious brain disease has hit Norway’s reindeer, and scientists are afraid of it spreading, Quartz, April 23, 2016What’s more baffling is that nobody knows how the disease got there. CWD was thought to be restricted to deer, elk, and moose in the US and South Korea. Though it’s theoretically possible that it jumped from another species in Norway (such as cows) to the reindeer, there are no previous known cases of that happening. The other possibility is that it just arose spontaneously—a protein misfolding into a prion by pure chance.

Wisconsin loses ground against fatal deer disease, Daily News, April 22, 2016The DNR tried to aggressively kill off deer after CWD was discovered near Mount Horeb in 2002, employing sharpshooters and asking hunters to kill as many deer as possible. The tactic devolved into a public relations nightmare: Hunters and landowners refused to get on board, calling herd reduction unattainable and a waste of deer.

Deadly animal prion disease appears in Europe, Nature, April 18, 2016A highly contagious and deadly animal brain disorder has been detected in Europe for the first time. Scientists are now warning that the single case found in a wild reindeer might represent an unrecognized, widespread infection. Chronic wasting disease (CWD) was thought to be restricted to deer, elk (Cervus canadensis) and moose (Alces alces) in North America and South Korea, but on 4 April researchers announced that the disease had been discovered in a free-ranging reindeer (Rangifer tarandus tarandus) in Norway. This is both the first time that CWD has been found in Europe and the first time that it has been found in this species in the wild anywhere in the world.

The first detection of Chronic Wasting Disease (CWD) in Europe, CWD-Info.org, April 5, 2016The Norwegian Veterinary Institute has diagnosed Chronic Wasting Disease (CWD) in a free-ranging reindeer from the Nordfjella population in South-Norway. The disease is well known in North America; however this is the first detection of CWD in Europe.
The sick female reindeer (Rangifer tarandus tarandus) was detected in the middle of March 2016 in connection with capture for GPS-collaring using helicopter performed by the Norwegian Institute for Nature Research (NINA. It died and the carcass was submitted to the Norwegian Veterinary Institute in Oslo for necropsy and laboratory examinations. It was an adult animal, says wildlife pathologist Turid Vikøren at Norwegian Veterinary Institute, who performed the necropsy.

Six more cases of CWD found in Newton County, CWD-Info.org, April 5, 2015
Six more deer from the Arkansas Game and Fish Commission’s chronic wasting disease sampling effort have turned up positive, according to the Wisconsin Veterinary Diagnostic Laboratory in Madison. This brings the total of CWD-positive cases of Arkansas deer and elk to 56. All six deer that tested positive came from Newton County inside the sampling focal area. The high number of positive results has already prompted a second sampling effort to determine whether the disease is present in other parts of the state.

Outdoors: To fight chronic wasting disease among deer, we must act now, Detroit Free Press, April 3, 2016CWD-infected deer have been found in Ingham, Clinton counties, making this problem even more dire. When a deer infected by Chronic Wasting Disease (CWD) nibbles a plant, the prion infection in its saliva absorbs into the plant’s roots and into the soil, and it emerges again with new sprouts. Should another deer graze that same trail, it will become infected with the fatal neurological disease. And Eaton County definitely is home to CWD.

Chronic Wasting Disease Cases Keep Rising In Newton Co. Deer Population, KFSM News, April 1, 2016So far, three of the elk samples have been found to be positive for CWD, the rest have been deer. Some of the CWD-positive samples came from dead or sick deer found outside the original sampling zone, which has prompted a second phase of sampling on a much larger scale.

More deer with chronic wasting disease reported, with one outside of a CWD management area, PA Live, March 26, 2016The Maryland Department of Natural Resources found another five deer with chronic wasting disease in Allegany County, just south of Bedford County in southwestern Pennsylvania. The location of the five new cases in Maryland is south of the area of Pennsylvania that has seen 17 free-ranging deer with CWD since 2013. Seven of those deer were uncovered last year.

Wisconsin leaders are ignoring the risk of chronic wasting disease, Isthmus, March 28, 2016A very rough estimate is that, since last November, around 80,000 people in Wisconsin may have been consuming deer that were infected with chronic wasting disease. And the Wisconsin Department of Natural Resources doesn’t want you to so much as even think about that. In an excellent piece, outdoor writer Patrick Durkin calls out the DNR for downplaying a dramatic increase in CWD in the Wisconsin deer herd. Based on limited testing during the 2015 deer season, about 9.5% of the herd is now infected. (That figure was under 2% in 2008.)

Five Deer Test Positive for Chronic Wasting Disease, CSD-Info.org, March 28, 2016The Maryland Department of Natural Resources has received laboratory confirmation that five white-tailed deer harvested in Allegany County tested positive for chronic wasting disease, a neurological disease in deer, bringing the total overall cases to 11. “Given that this disease is now present in the region, our wildlife biologists will continue to work diligently to document and monitor its presence, which, so far, has been limited to Allegany County. We urge citizens to only consume the meat of deer that appear healthy.”

Michigan confirms new CWD-positive findings; total is now seven deer, Michigan DNR Bulletin, March 18, 2016One of the newly confirmed CWD-positive deer is a 9-month-old male from Meridian Township (Ingham County), and the other is a 2 ¾-year-old female from Watertown Township (Clinton County).
The intensive removal of deer in these areas has a two-part benefit. One, it helps us understand prevalence rates and spread so we can make informed decisions on disease management moving forward; and two, by removing individual deer around areas with known disease occurrence, it reduces the potential for spread and accumulation in our deer herd, which has benefits not only locally, but on the periphery of the management zone as well.

News On Deer Chronic Wasting Disease Gets Worse, Grand View Outdoors, March 1, 2016 Last year there was a glimmer of hope when a potential vaccine was reported. However, in November 2015, Dr. Mary Wood, a wildlife veterinarian with Wyoming Fish and Game reported that “We have not observed a protective effect associated with this vaccine.”The magic bullet that everyone hoped for is not there — at least not yet. This was the result after a three-year trial on 38 elk in a research facility in Wyoming. There was a slight glitch at the beginning of this research and the final results won’t be known for a year, but the preliminary data does not give much hope for the vaccine. That doesn’t mean that this research was a waste of time. It could lead to other, more productive research for those looking for an answer to CWD. But for the time being, the possibility of a vaccine to slow CWD is not an option.

Deer disease confirmed in Hartley Co., WALB, Feb 28, 2016HARTLEY COUNTY, TX (KFDA) – The first case of a disease fatal to deer has been confirmed in the Panhandle. A free-ranging mule deer in Hartley County tested positive for chronic wasting disease (CWD).

DNR lauds partners in continuing battle against chronic wasting disease, Statewide DNR News, Dec 30, 2015Deer suspected positive for CWD found in Watertown Township; Jan. 12 public meeting set. Earlier this year, Michigan’s first case of CWD in free-ranging white-tailed deer was confirmed in Meridian Township in Ingham County.


 

  • Occurance of Chronic Wasting Disease (CWD), CDC, Jan 2016As of January 8, 2016, there were 150 counties in 20 states with reported CWD in free-ranging cervids.
  • Deer Killed In Clinton County May Have CWD, WILX.com, Dec 31, 2015Watertown Twp., Clinton Co. – The Michigan Department of Natural Resources says a deer killed by a bow hunter earlier this month may have Chronic Wasting Disease.
  • Weekly CWD Status Update – Updated 12/4/20154th deer tested positive for chronic wasting disease in Eaton County.
  • Deer disease has food banks on edge, Lansing State Journal, Nov 13, 2015All deer harvested within a nine-township core area around Meridian Township must be taken to a check station for testing. And processors who accept deer from the core area are required to isolate those carcasses from other meat.
  • DNR: Deer killed in DeWitt Township may have chronic wasting disease, Lansing STate Journal, Nov 13, 2015While DeWitt Township is one of nine townships that make up what the DNR has designated as the CWD Core Area, until now, no wild deer with the disease had been found outside Meridian Township.
  • DNR: Deer killed in Clinton Co. may have wasting disease, Detroit Free Press, Jan 4, 2016State wildlife officials say a deer killed by a bow hunter in Watertown Township this month might have been carrying chronic wasting disease. Samples of the deer — a 11/2-year-old doe — were sent to a federal laboratory in Iowa on Monday for more detailed testing.
  • Hunters in affected areas encouraged to have deer checked for CWD, Michigan DNR bulletin,11/13/2015The DNR strongly encourages hunters in a broader CWD Management Zone – consisting of Clinton, Ingham and Shiawassee counties – to check their deer and have them tested for CWD as well.
  • DNR video: Wasting disease prompts tighter deer hunt rules, MLive, Sept 30, 2015Three deer have been discovered with the disease this year, all in the Lansing area. The neurological disease, which also kills elk and moose, was first found in wild deer in western states in 1985. The first Michigan infection was discovered in Kent County in 2008. The DNR developed a disease response plan in 2002.

    Stricter rules are meant to stem the spread of the disease.
  • Chronic Wasting Disease Is Spreading, Can It Be Stopped?, Grand View Outdoors, Oct 8, 2015
    “We call them Droolers and Shakers,” said Don Bates, former supervisor of chronic wasting disease operations for the Wisconsin Department of Natural Resources. Bates, now retired, said many people ignore CWD because most infected deer die alone and unseen. Although some huddle against a garage or near a dryer vent in winter to protect themselves from the cold, most die unseen and undocumented in thickets, wetlands or river bottoms. It’s getting worse at faster and higher rates than ever.”

  • CWD is an always-fatal brain disease. Once deer contract it, their life expectancy is about 18 to 20 months. They typically look healthy the first 16 months before showing its effects. Those signs include tremors, heavy drool, staggering and stark ribs and spinal bones outlined beneath a ratty hide. In advanced stages, they lose their fear of humans.
    Map of CWD as of April 2015
    Will CWD wipe out deer for future hunters?, Green Bay Press Gazette, Sept 4, 2015Like it or not, the odds of a sickly Wisconsin deer herd in 2071 are looking more likely each year. CWD prevalence in southern Wisconsin has doubled across all ages in both sexes of deer the past 13 years. In at least one area, four of every 10 adult bucks carries the disease, and in at least two other areas one in four mature bucks are infected.
  • Follow Illinois, not Wisconsin, to slow spreading CWD, Journal-Sentinel, Aug 19, 2015Although the Wisconsin DNR initially attempted to eradicate the disease with aggressive measures, including sharpshooters and longer hunting seasons, it now uses only monitoring and surveillance. Rates of the disease have increased substantially since Wisconsin abandoned targeted deer reduction efforts.

    The difference in CWD prevalance rates in the two states is due mostly to management strategy, according to University of Illinois researchers Jan Novakofski and Michelle Green. Illinois has remained committed to reducing deer in areas with known CWD-positive animals. The IDNR also is testing deer for CWD in a wide area, hoping to find any new disease sites.

    For the sampling year ending June 30, the CWD prevalence rate in Illinois was 1.2%, according to Paul Shelton, forest wildlife manager for the Illinois Department of Natural Resources. “This is a very challenging issue,” Shelton said. “We can’t declare victory, but we can say that the work we’ve been doing has helped keep the rates lower than they otherwise would be.”
  • DNR confirms third deer positive for CWD; hunter participation critical this fall, Aug 6 2015
  • Two new deer were found this week, testing positive for Chronic Wasting Disease, Michigan Emerging Disease Issues, Chronic Wasting Disease (CWD)
    Weekly CWD Status Update – Updated 7/17/2015

    cwd7-17-15

  • Michigan confirms CWD in second free-ranging white-tailed deer, Michigan DNR sent this bulletin at 07/17/2015The Michigan departments of Natural Resources (DNR) and Agriculture and Rural Development (MDARD) have confirmed a second free-ranging deer in Meridian Township (Ingham County) has tested positive for chronic wasting disease (CWD), a fatal neurological disease that affects white-tailed deer, mule deer, elk and moose. This second case is a 2-year-old male found less than a mile from the initial positive female deer, confirmed this past May. Genetic testing is being conducted to see if the two deer are related.
  • Ten Deer Test Positive for CWD in 2014-2015Kansas Wildlife, Parks and Tourism, July 16, 2015A total of 640 deer were tested for chronic wasting disease (CWD) during the 2014-2015 seasons, and 10 of those were confirmed positive. Samples were obtained from deer killed by hunters in southcentral and southwest parts of Kansas and from sick and/or suspect deer observed in the eastern, northcentral and northwest parts of the state.
  • ‘Surprising’ Discovery Made About Chronic Wasting Disease , Food and Safety News, June 2015According to researchers at The University of Texas Health Science Center at Houston (UTHealth), grass plants can bind, uptake and transport infectious prions. Why this is so important takes some understanding of what prions are. Much smaller than bacteria, prions are single proteins that cannot be destroyed by typical “kill strategies” such as extreme heat or ultraviolet light.

    Soto’s team analyzed the retention of CWD and other infectious prion proteins and their infectivity in wheat grass roots and leaves that had been incubated with prion-contaminated material. They discovered that even highly diluted amounts of the material can bind to the roots and leaves. From there, they fed the wheat grass to hamsters, which became infected with the disease. The team also found the infectious prion proteins in plants that had been exposed to urine and feces from prion-infected hamsters and deer.
  • USGS Chronic Wasting Disease spreading

  • Chronic wasting disease spreading among deer in Michigan, KTTC News, June 17, 2015MICHIGAN – Two dozen deer have been collected in the first week of a targeted deer kill in Meridan Township, in Michigan, after chronic wasting disease killed animals in the area. According to the Lansing State Journal, experts estimate 59 deer in the township are infected. The disease is fatal and causes a mutated protein to multiply, and attack the animal’s immune system.
  • DNR works to contain chronic wasting disease found in Meridian Township deer, Great Lakes Echo, June 5, 2015The Michigan Department of Natural Resources says it’s found a deer in Meridian Township that’s tested positive for chronic wasting disease. It’s the first reported case of the disease in the state since 2008, and the very first time it has occurred in a wild deer population. Chronic wasting disease is not harmful to humans, but is always fatal to deer.
  • Deer kill under way in Meridian Township, Lansing State Journal, June 4, 2015The hunt “certainly will” continue through a lot of the summer, Stewart said, but he doesn’t anticipate it extending into hunting season. Bow season begins Oct.1. “We are in this for the long haul, unfortunately,” he added.

    It’s thought that chronic wasting disease — which is not transmittable to humans — is more common in larger populations. The fatal neurological disease affects white-tailed deer, mule deer, moose and elk.

  • Midnight Snipers Fighting CWD, WJIMAM.com, May 27, 2015In the wake of Chronic Wasting Disease or CWD being confirmed in a wild Michigan deer, the Department of Natural Resources is moving quickly to implement an emergency plan it’s had for in place years but hoped to never use. The emergency management plan is aggressive and will likely change the dynamics of the deer population in the state for generations to come.
  • CWD in Michigan, Deer Michigan, May 26,2015The Michigan Department of Natural Resources has an emergency response plan for CWD, which it originally created in 2002, deployed in 2008 after a Kent County deer at a captive cervid facility tested positive for CWD, and updated in 2012 based on what it learned from that experience and from more recent science on CWD. So what is the DNR doing? What can we expect? What can we do to help? What are hunters required to do? What can’t we do? What should we do? Use the resources below to find out!
  • Michigan confirms first case of CWD in free-ranging white-tailed deer, Michigan DNR sent this bulletin at 05/26/2015 02:01 PM EDT:Press ReleaseThe Michigan departments of Natural Resources (DNR) and Agriculture and Rural Development (MDARD) today confirmed that a free-ranging deer in Meridian Township (Ingham County) has tested positive for chronic wasting disease (CWD), a fatal neurological disease that affects white-tailed deer, mule deer, elk and moose. This is the first time the disease has been found in Michigan’s free-ranging deer population.
    The disease is caused by the transmission of infectious, self-multiplying proteins (prions) contained in saliva and other body fluids of infected animals. Susceptible animals can acquire CWD by direct exposure to these fluids or from environments contaminated with these fluids or the carcass of a diseased animal. Once contaminated, research shows that soil can remain a source of infection for long periods of time, making CWD a particularly difficult disease to eradicate. Some chronically CWD-infected animals will display abnormal behaviors, progressive weight loss and physical debilitation. There is no cure; once a deer is infected with CWD, it will die.
  • Emerging Disease Issues > Chronic Wasting Disease (CWD), Michigan Emerging Disease Issues, 2015Links to reports, documents, pictures
  • Pa. expands deer CWD disease area, WITF, May 6, 2015Six deer killed on Pennsylvania highways tested positive for chronic wasting disease in 2014 and so far this year.

  • DNR > Wildlife & Habitat > Wildlife Disease > Chronic Wasting Disease and Hunting, Michigan DNR, 2015Disease information, How it affects Hunters, other resources
  • Grass plants can transport infectious prions, Science Daily, May 15 2015“There is no proof of transmission from wild animals and plants to humans,” said lead author Claudio Soto, Ph.D., professor of neurology at UTHealth Medical School and director of the UTHealth George and Cynthia W. Mitchell Center for Alzheimer’s Disease and Other Brain Related Illnesses. “But it’s a possibility that needs to be explored and people need to be aware of it. Prions have a long incubation period.”
    Soto’s team analyzed the retention of infectious prion protein and infectivity in wheat grass roots and leaves incubated with prion-contaminated brain material and discovered that even highly diluted amounts can bind to the roots and leaves. When the wheat grass was consumed by hamsters, the animals were infected with the disease. The team also learned that infectious prion proteins could be detected in plants exposed to urine and feces from prion-infected hamsters and deer.
  • Can DEER droppings transmit CHRONIC WASTING DISEASE to HUMANS?, Natural Unseen Hazards Blog, April 2, 2015The biggest potential problem you face in having so many deer droppings in your garden is the potential for the transmission of E. coli and chronic wasting disease (CWD), a deer and elk disease similar to mad cow disease. The Pennsylvania Game Commission’s website notes that CWD has been detected in several Pennsylvania locations since it was first found in the state in 2012. After a bit of investigating, I discovered that the jury is still out on whether and how chronic wasting disease can be transmitted to humans. That being said, both the Pennsylvania Game Commission’s website and the Center for Disease Control’s website note that there’s no evidence that CWD is transmissible to humans. But they do not recommend eating meat from a deer that has tested positive for CWD. From what I found, fecal-to-oral transmission from deer to humans has not been completely ruled out, meaning the disease could possibly be transmitted to a human if she were to touch contaminated deer excrement and then inadvertently introduce it into her mouth, but no cases of this type of transmission have ever been recorded.
  • Is chronic wasting disease a threat to humans?, Virology Blog, March 11, 2015Another concern is that prions of chronic wasting disease could be transmitted to cows grazing in pastures contaminated by cervids. Prions can be detected in deer saliva and feces, and contamination of grass could pass the agent on to cows. In the laboratory, brain homogenates from infected deer can transmit the disease to cows. Therefore it is possible that cervid prions could enter the human food chain through cows.
    Although the risk of human infection with CWD prions appears to be low, hunters should not shoot or consume an elk or deer that is acting abnormally or appears to be sick, to avoid the brain and spinal cord when field dressing game, and not to consume brain, spinal cord, eyes, spleen, or lymph nodes. No case of transmission of chronic wasting disease prions to deer hunters has yet been reported.
  • 10 Reasons You Don’t Want CWD in Your Woods, QDMA, Feb 17, 2015There is much confusion between CWD and hemorrhagic disease (EHD and bluetongue virus). EHD and bluetongue are serious matters in their own right, and their impact is more rapid, more visible and more dramatic. Deer carcasses pile up quickly in outbreak areas. By contrast, CWD is a slow poison, building over time, taking months or years to kill individual deer that are spreading the infection as they slowly die. Unlike the EHD and bluetongue viruses transmitted by insects, the CWD blight is steadily growing with no breaks, no recovery periods, no survivors, and no resulting immunity. The known impact sites for CWD in wild deer or elk currently include 19 states and two Canadian provinces, a list that has been growing recently. Minnesota and Maryland discovered CWD in free-roaming deer in 2011; Missouri in 2012; Pennsyvlania in 2013; and last year, Iowa. We should be concered about both EHD and CWD, but an important difference is that CWD can still be prevented from spreading to new areas. If you don’t hunt in or near regions with CWD, be very happy, and support all efforts to prevent the disease’s arrival near you. If it hits, the biological damage to the deer herd will be slow to build, but the impact on you and your hunting will likely be immediate and significant.
  • Four Maryland Deer Test Positive for Chronic Wasting Disease, Maryland DNR, Jan 20, 2015The Maryland Department of Natural Resources received laboratory confirmation on January 16, 2015 that four additional white-tailed deer harvested in Maryland tested positive for chronic wasting disease (CWD), bringing the total number of overall positive cases to six. The first confirmed case of CWD in Maryland was reported in February 2011 and the second was found in 2014, both from Allegany County. Maryland is one of more than 20 states and Canadian provinces with CWD documented in deer, elk or moose.

  • First successful vaccination against ‘mad cow’-like wasting disease in deer, Science Daily, Dec 21, 2014The study, to be published in Vaccine online Dec. 21, documents a scientific milestone: The first successful vaccination of deer against chronic wasting disease (CWD), a fatal brain disorder caused by unusual infectious proteins known as prions. Prions propagate by converting otherwise healthy proteins into a disease state.
  • The importance of localized culling in stabilizing chronic wasting disease prevalence in white-tailed deer populations, Preventive Veterinary Medicine, Jan 2014We addressed the functional differences between hunting and government culling programs for managing chronic wasting disease (CWD) in white-tailed deer by comparing prevalence over a 10-year period in Illinois and Wisconsin. When both Illinois and Wisconsin were actively culling from 2003 – 2007, there were no statistical differences between state CWD prevalence estimates. Wisconsin government culling concluded in 2007 and average prevalence over the next five years was 3.09 ± 1.13% with an average annual increase of 0.63%. During that same time period, Illinois continued government culling and there was no change in prevalence throughout Illinois.
  • New York : DEC Amends New York’s Chronic Wasting Disease (CWD) Regulation in Response to Discovery of Disease in Ohio, New York State Department of Environmental Conservation, November 03, 2014In late October, the Ohio Department of Agriculture confirmed a case of CWD in a white-tailed deer on a deer farm in Holmes County, OH – the first positive CWD case in the state. CWD has also been confirmed in captive deer on multiple farms in Pennsylvania and in the wild deer herd in that state.
  • Pat Durkin column: Study suggests shooting more bucks to reduce CWD, Green Bay Gazette, March 28, 2014A just-released University of Wisconsin study on chronic wasting disease recommends focusing more hunting pressure on the deer most likely to carry and spread CWD in whitetails: bucks, the males of the species.
  • Transmission of Chronic Wasting Disease in Wisconsin White-Tailed Deer: Implications for Disease Spread and Management, PlosOne, March 2014. Using maximum-likelihood methods to evaluate alternative multi-state deterministic models of CWD transmission, harvest data strongly supports a frequency-dependent transmission structure with sex-specific infection rates that are two times higher in males than females.
  • The importance of localized culling in stabilizing chronic wasting disease prevalence in white-tailed deer populations, Preventative Veterinary Medicine, Jan 2014 Despite its unpopularity among hunters, localized culling is a disease management strategy that can maintain low disease prevalence while minimizing impacts on recreational deer harvest.
  • Chronic wasting disease, Prion, Jan-March 2012Transmissible spongiform encephalopathies (prion diseases) in animals may be associated with a zoonotic risk potential for humans as shown by the occurrence of variant Creutzfeldt-Jakob disease in the wake of the bovine spongiform encephalopathy epidemic. Thus, the increasing exposure of humans in North America to cervid prions of chronic wasting disease (CWD) in elk and deer has prompted comprehensive risk assessments. The susceptibility of humans to CWD infections is currently under investigation in different studies using macaques as primate models. The necessity for such studies was recently reinforced when disease-associated prion protein and its seeding activity were detected in muscles of clinically inconspicuous CWD-infected white-tailed deer (WTD).
  • CWD: A 10-Year Retrospective, Wisconsin Dept of Natural Resources, In February 2002, the DNR was notified that three deer harvested the previous fall from Deer Management Unit 70A in western Dane County had tested positive for CWD. This discovery launched an intensive surveillance effort in Wisconsin that continues today. As of February 2012, nearly 172,000 wild white-tailed deer have been sampled, over 1,800 of which have tested CWD-positive.
    There appear to be two main areas of CWD infection in Wisconsin. One is centered in western Dane and eastern Iowa counties. The second is located in northern Illinois and extends into southeastern Wisconsin. Illinois first detected the presence of CWD in this area in the fall of 2002 and as of April 2011, 336 CWD-positive deer have been found.
  • Mad Cow Disease of Deer Can be Controlled by Targeted Culling, Long-term Study Finds, Nature World News, Oct 21, 2013
  • Chronic Wasting Disease (CWD), USGS National Wildlife Health Center, May 21, 2013
  • Chronic Wasting Disease, An emerging threat, Humane Society, Oct 4, 2012In order to reduce the potential of future biological threats from this and other zoonotic diseases on a larger scale, states must ban game farms and captive hunts. The high population densities that characterize captive hunt facilities greatly increase the risk of disease transmission.
    The risk of CWD spreading to native populations of wildlife is taken very seriously. Thus far, testing and “depopulating” are the chosen methods of eradication.
  • Deer density and disease prevalence influence transmission of chronic wasting disease in white-tailed deer, Ecosphere, Jan 2013. We evaluated the influence of deer density,
    landscape features, and soil clay content on transmission of chronic wasting disease (CWD) in young white-tailed deer in south-central Wisconsin, USA. We evaluated how frequency-dependent, density-dependent, and intermediate transmission models predicted CWD incidence rates in harvested yearling deer. An intermediate transmission model, incorporating both disease prevalence and density of infected deer, performed better than simple density- and frequency-dependent models. Our results indicate a combination of social structure, non-linear relationships between infectious contact and deer density, and distribution of disease among groups are important factors driving CWD infection in young deer.
  • Study Spells Out Spread of Brain Illness in Animals, New York Times, Sept 9, 2009There is no evidence to date that humans who hunt, kill and eat deer have developed chronic wasting disease. Nor does the prion that causes it pass naturally to other animal species in the wild.
    Besides mad cow and chronic wasting disease, the prion diseases include Creutzfeldt-Jakob, which leads to dementia and death in humans. Each of these diseases is caused by a different strain, and all strains behave somewhat differently.
    In the case of chronic wasting disease, “it turns out prions exploit the oldest trick in the book used by pathogens and parasites,” said Mike Miller, a veterinarian at the Colorado Division of Wildlife who is an expert on chronic wasting disease.
    “Fecal-oral transmission is very effective,” Dr. Miller continued. Each deer excretes about two pounds of fecal pellets a day. As wild herds move around, or captive herds are trucked between states, more soil becomes infected.
  • The Spread of CWD in White-tailed Deer, The BuckManager, Oct 29, 2009The finding suggests a reasonable explanation for transmission of the disease among white-tailed deer, mule deer, and possibly elk and moose in the environment. While the study reveals that prions are shed in feces of symptomatic deer as well, the discovery that the infected deer shed prions in their feces many months before they show clinical symptoms is the most unsettling. White-tailed deer, mule deer, elk and moose inadvertently consume feces and soil in the course of their daily browsing and grazing.
  • Prions found in feces of deer asymptomatic for chronic wasting disease, UCSF, Sept 9, 2009Scientists have discovered that deer asymptomatic for a fatal brain condition known as chronic wasting disease excrete the infectious prions that cause the disease in their feces. The finding, they say, suggests a plausible explanation for transmission of the disease among deer and, possibly, elk and moose in the environment. While the study reveals that prions are shed in feces of symptomatic deer as well, the discovery that the infected deer shed prions in their feces many months before they show clinical symptoms has particularly provocative implications.
    Deer, elk and moose inadvertently consume feces and soil in the course of their daily grazing. Given this, the team set out to determine whether the animals could develop chronic wasting disease through long-term consumption of contaminated feces. They did so by measuring the amount of prions contained in the feces of orally infected deer up until the time they became symptomatic and then calculated whether prolonged exposure to the concentrations of prions in these feces would be enough to cause the disease.
  • Host culling as an adaptive management tool for chronic wasting disease in white-tailed deer: a modelling study, J Appl Ecol. Apr 2009; 46(2): 457–466.
  • Chronic Wasting Disease and Potential Transmission to Humans, CDC, June 2004 Increasing spread of CWD has raised concerns about the potential for increasing human exposure to the CWD agent. The foodborne transmission of bovine spongiform encephalopathy to humans indicates that the species barrier may not completely protect humans from animal prion diseases. Conversion of human prion protein by CWD-associated prions has been demonstrated in an in vitro cell-free experiment, but limited investigations have not identified strong evidence for CWD transmission to humans. More epidemiologic and laboratory studies are needed to monitor the possibility of such transmissions.
  • Chronic Wasting Disease and Potential Transmission to Humans, CDC Emerging Infectious Diseases, June 2004Chronic wasting disease (CWD) of deer and elk is endemic in a tri-corner area of Colorado, Wyoming, and Nebraska, and new foci of CWD have been detected in other parts of the United States. Although detection in some areas may be related to increased surveillance, introduction of CWD due to translocation or natural migration of animals may account for some new foci of infection. Increasing spread of CWD has raised concerns about the potential for increasing human exposure to the CWD agent. The foodborne transmission of bovine spongiform encephalopathy to humans indicates that the species barrier may not completely protect humans from animal prion diseases. Conversion of human prion protein by CWD-associated prions has been demonstrated in an in vitro cell-free experiment, but limited investigations have not identified strong evidence for CWD transmission to humans. More epidemiologic and laboratory studies are needed to monitor the possibility of such transmissions.

  • Chronic Wasting Disease: Frequently Asked Questions, Illinois DNR
  • Chronic Wasting Disease: Moving On, Wyoming Game & Fish Dept

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