CWD/Prion News

• CWD forces more than 100 elk into quarantine - Saskatchewan published on Apr 16, 2009
  The second case this year of Chronic Wasting Disease in Saskatchewan has put an elk herd of more than 100 in quarantine.The Canadian Food Inspection Agency confirmed that a single elk suffered from the incurable disease, and then penned the entire herd, said CFIA animal health program manager Connie Argue.
• Chronic wasting disease spreading published on Mar 22, 2009
  The Edmonton JournalMarch 22, 2009 Eight new cases of chronic wasting disease (CWD) in wild deer were found as part of the 2008 fall surveillance for the disease, according to provincial government figures. The new cases were found among the 4,347 deer heads that have been tested since last Sept. 1.Seven of the animals were shot by hunters, and one was a road-kill collected by Fish and Wildlife staff along the Alberta-Saskatchewan border. Seven were mule deer and one was a white-tailed deer.Two deer were detected in Canadian Forces Base Wainwright, which is the farthest west the disease has been detected in wild deer in Alberta. This indicates the disease has penetrated at least 75 kilometres into Alberta and is about 170 km east of Edmonton.The remaining six cases were detected near past positive cases. This means a total of 61 cases have been found in wild deer in Alberta since 2005.CWD is a prion disease like bovine spongiform encephalopathy -- BSE, or mad cow disease -- and is always fatal. It affects ungulates, such as deer and elk. It isn't known to infect humans, but the World Health Organization cautions people not to eat the meat of affected animals.The province has used deer killed by hunters to test for CWD.In addition, over the last three years the province has held a winter control program that culled deer in a 10-kilometre radius around any area where an animal that tested positive was found, and thinned herds in select locations.Staff are now conducting post-hunting-season aerial surveys to count deer near the Alberta-Saskatchewan border in order to plan future disease-management programs.hbrooymans@thejournal.canwest.com
• Common soil mineral degrades the nearly indestructible prion published on Jan 14, 2009
  In addition to being perhaps the weirdest infectious agent know to science, the prion is also the most durable. It resists almost every method of destruction from fire and ionizing radiation to chemical disinfectants and autoclaving, which reduce prion infectivity but fail to completely eliminate it. Now, however, a team of Wisconsin researchers has found that a common soil mineral, an oxidized from of manganese known as birnessite, can penetrate the prion's armor and degrade the protein.
• Buck at Jefferson County preserve had chronic wasting disease published on Dec 19, 2008
  Buck at Jefferson County preserve had chronic wasting disease By Lee Bergquist of the Journal Sentinel Posted: Dec. 19, 2008A 7-year-old buck from a Jefferson County hunting preserve has tested positive for chronic wasting disease, state agriculture officials reported Friday. The white-tailed deer was killed Dec. 1 as part of an effort by the owner of the 53-acre preserve to cull his herd and repopulate it with new stock, said Donna Gilson, a spokeswoman for the Department of Agriculture, Trade and Consumer Protection. Two deer remain on the preserve and will be killed. They have been quarantined by State Veterinarian Robert Ehlenfeldt. Gilson said the agriculture department will trace any possible movement of deer from the preserve to other captive facilities. The hunting preserve, Maple Hill Whitetails, is owned by Steve Hookstead of Helenville. According to the preserve's Web site, the business offers hunts, and breeding and genetics services. Hookstead was unavailable for comment.Hookstead's breeding herd will not be killed because the deer are separated from the hunting preserve by a fence, Gilson said. Chronic wasting disease was discovered in wild deer in Wisconsin in 2002. Since then, 98 deer and one elk have tested positive from nine captive facilities. More than 22,500 farm-raised deer and elk have been tested.Chronic wasting disease is always fatal and affects deer, elk and moose. The disease is a transmissible spongiform encephalopathy, a class of diseases that includes mad cow disease in cattle, scrapie in sheep and Creutzfeldt-Jakob disease in humans. According to the World Health Organization, any tissue that may have come from deer with CWD should not be eaten, but there is no evidence the disease can be transmitted to humans.
• Researchers tackle fatal brain disease published on Nov 21, 2008
  WYOMING (2008-11-21) Peter O'Dowd reports on the efforts in Wyoming and around the country to manage Chronic Wasting Disease.
• DNR says chronic wasting disease increasing in parts of state published on Nov 07, 2008
  In its first long-term analysis of how to manage chronic wasting disease in Wisconsin, the Department of Natural Resources acknowledged this week that the fatal deer disease can't be eliminated in some parts of the state.
• CWD changing hunting landscape published on Nov 02, 2008
  The bloom came off New York's rose in 2005, when chronic wasting disease -- a fatal, contagious neurological disease of deer and elk that is similar to mad cow disease -- was discovered in two captive deer herds in Oneida County in the center of the state.Vermonters cannot bring home a deer carcass from neighboring towns in New York, yet a moratorium on importing captive deer and elk in Vermont was allowed to expire last year. This despite the fact that transporting captive deer and elk has a long track record of spreading CWD, and there is no fool-proof way to determine if even an ostensibly healthy deer has the disease
• CWD-positive white-tailed deer found in Junction City hunting preserve published on Oct 10, 2008
  CWD-positive white-tailed deer found in Junction City hunting preserveContact: Donna Gilson608-224-5130MADISON -- A white-tailed deer on a Portage County hunting preserve has tested positive for chronic wasting disease, State Veterinarian Dr. Robert Ehlenfeldt announced today. The National Veterinary Services Laboratory in Ames, Iowa, reported the test results Thursday, Oct. 9. The animal was a 7-year-old doe owned by Alligator Creek Whitetails LLC and was one of about 150 deer in the preserve. The 119-acre preserve near Junction City in the Town of Eau Pleine in Portage County. The deer was killed on Sept. 20. The Animal Health Division of the Wisconsin Department of Agriculture, Trade and Consumer Protection's investigation will look at the animal's history and trace movements of deer onto and off the property to find out whether other herds may have been exposed to CWD. Deer herds on hunting preserves are generally not on the state's CWD monitoring program. However, Wisconsin Department of Agriculture, Trade and Consumer Protection rules require that all farm-raised deer and elk 16 months or older must be tested when they die, go to slaughter or are killed. Ehlenfeldt quarantined the Alligator Creek herd immediately. The quarantine stops movement of live deer off or onto the property without written permission from the department. The business will be allowed to conduct hunts through Jan. 15, because properly handled dead animals leaving the premises do not pose a disease risk. Hunters must be notified of the quarantine and the reason for it. This is the first new CWD-infected herd on a Wisconsin farm since January 2005. To date, 97 farm-raised animals in Wisconsin have tested positive for CWD on eight farms and hunting preserves, including 82 on a single Portage County operation. One of the infected animals was an elk; the rest have been white-tailed deer. To date, more than 21,500 farm-raised deer and elk have been tested.
• Live CWD test in elk shows promise published on Jul 07, 2008
  Researchers in May completed their third year of evaluating and validating the first live rectal-tissue biopsy method for detecting chronic wasting disease in captive and wild elk.
• Prions' great escape published on Jul 01, 2008
  Prions, the infective particles behind diseases such as bovine spongiform encephalopathy (BSE), can breach standard sewage treatment methods, new research shows.
• Chronic wasting disease under the microscope of researchers published on Jun 06, 2008
  Researchers from the Alberta Prion Institute have been studying wild populations of deer to learn more about chronic wasting disease and its control in the province
• USDA AND COLORADO STATE UNIVERSITY RESEARCHERS DEVELOP FIRST LIVE TEST FOR CHRONIC WASTING DISEASE IN ELK published on May 30, 2008
  Researchers from the U.S. Department of Agricultures Animal and Plant Health Inspection Service (APHIS) and Colorado State University (CSU) 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
• First-ever case of Chronic Wasting Disease in wild elk found in Saskatchewan published on May 15, 2008
  The first-ever cases of chronic wasting disease (CWD) in wild elk have been discovered in Saskatchewan, but the provincial government hasn't been very public about it.The animals were found dead west of Nipawin in early April, close to Fort a la Corne in the province's east-central region.
• Chronic wasting disease surfaces in Hampshire published on May 09, 2008
  ROMNEY - Test results have detected the chronic wasting disease agent in 11 white-tailed deer collected this spring in Hampshire County, according to the West Virginia Division of Natural Resources.These collections have been designed to investigate and determine the prevalence and distribution of the disease in Hampshire County. Wildlife biologists are carefully monitoring changes in the structure of the deer herd within the CWD containment area.
• Board OKs plan for CWD management published on Apr 24, 2008
  Members of the state Natural Resources Board approved a framework for chronic wasting disease (CWD) management during the 2008 deer hunting season today, while stressing that they ultimately want a comprehensive new statewide plan for controlling the fatal nervous system disease.
• High titers of mucosal and systemic anti-PrP antibodies abrogate oral prion infection in mucosal-vaccinated mice published on Apr 22, 2008
  Significant outbreaks of prion disease linked to oral exposure of the prion agent have occurred in animal and human populations. These disorders are associated with a conformational change of a normal protein, PrPC (C for cellular), to a toxic and infectious form, PrPSc (Sc for scrapie). None of the prionoses currently have an effective treatment. Some forms of prion disease are thought to be spread by oral ingestion of PrPSc, such as chronic wasting disease and variant Creutzfeldt-Jakob disease. Attempts to obtain an active immunization in wild-type animals have been hampered by auto-tolerance to PrP and potential toxicity. Previously, we demonstrated that it is possible to overcome tolerance and obtain a specific anti-PrP antibody response by oral inoculation of the PrP protein expressed in an attenuated Salmonella vector. This past study showed that 30% of vaccinated animals were free of disease more than 350 days post-challenge. In the current study we have both optimized the vaccination protocol and divided the vaccinated mice into low and high immune responder groups prior to oral challenge with PrPSc scrapie strain 139A. These methodological refinements led to a significantly improved therapeutic response. 100% of mice with a high mucosal anti-PrP titer immunoglobulin (Ig) A and a high systemic IgG titer, prior to challenge, remained without symptoms of PrP infection at 400 days (log-rank test P0.0001 versus sham controls). The brains from these surviving clinically asymptomatic mice were free of PrPSc infection by Western blot and histological examination. These promising findings suggest that effective mucosal vaccination is a feasible and useful method for overcoming tolerance to PrP and preventing prion infection via an oral rout
• Report: Recreational hunting alone will not control CWD published on Apr 09, 2008
  Report outlining that hunting alone cannot control CWD in WI and that effective CWD management will require dramatic and sustained efforts.
• West Virginia: Four Additional Deer Test Positive for Chronic Wasting Disease In Hampshire County, West Virginia published on Apr 04, 2008
  West Virginia continues efforts to define prevalence and distribution of CWD.
• British Researchers Discover New Variant of CJD published on Apr 01, 2008
  A case of Creutzfeldt-Jakob Disease in Britain changes predictions of future infection rates.
• CWD Update #90 - Bryan J. Richards, USGS National Wildlife Health Center. published on Mar 07, 2008
  Regional and State updates on CWD occurances and news.
• Susceptibility of Cattle to First-passage Intracerebral Inoculation with Chronic Wasting Disease Agent from White-tailed Deer published on Mar 01, 2008
  Fourteen, 3-month-old calves were intracerebrally inoculated with the agent of chronic wasting disease (CWD) from white-tailed deer (CWDwtd) to compare the clinical signs and neuropathologic findings with those of certain other transmissible spongiform encephalopathies (TSE, prion diseases) that have been shown to be experimentally transmissible to cattle (sheep scrapie, CWD of mule deer CWDmd, bovine spongiform encephalopathy BSE, and transmissible mink encephalopathy).